Home
Class 11
PHYSICS
A block of mass 5 kg is initially at res...

A block of mass `5 kg` is initially at rest on a rough horizontal surface. A force of `45 N` acts over a distance of `2 m`. The force of friction acting on the block is `25 N`. The final kinetic energy of the block is

A

`40 J`

B

`90 J`

C

`50 J`

D

`140 J`

Text Solution

Verified by Experts

The correct Answer is:
`(1)`
`Delat K = W, K.E_(f) -0 = F _("net") S cos theta`
Promotional Banner

Topper's Solved these Questions

  • WORK , ENERGY & POWER

    NARAYNA|Exercise EXERCISE -III|54 Videos

  • WORK , ENERGY & POWER

    NARAYNA|Exercise EXERCISE IV|43 Videos

  • WORK , ENERGY & POWER

    NARAYNA|Exercise EXERCISE -II (C.W)|75 Videos

  • WAVES

    NARAYNA|Exercise Exercise-IV|56 Videos

  • WORK POWER AND ENERGY

    NARAYNA|Exercise Level-VI (Integer)|12 Videos

Similar Questions

Explore conceptually related problems

A block of mass 4 kg is initially at rest on a horizontal frixtionless surface. A horizontal force vec(F) = (3+x) hat(i) newtons acts on it, when the block is at x = 0 . The maximum kinetic energy of the block between x = 0 and x = 2 m is

A block of mass 2 kg, initially at rest on a horizontal floor, is now acted upon by a horizontal force of 10 N . The coefficient of friction between the block and the floor is 0.2. If g = 10 m//s^(2) , then :

A block of mass m is placed on a rough horizontal surface. If minimum force to pull the block is (mg)/(2) then coefficient of friction is :

A 20 kg block is initially at rest on a rough horizontal surface. A horizontal force of 75 N is required to set the block in motion. After it is in motion, a horizontal force of 60 N is required to keep the block moving with constant speed. The coefficient of static friction is

A 10 kg block is initially at rest on a rough horizontal surface. A horizontal force of 60 N is required to set the block in motion . After it is in motion , a horizontal force of 50 N is required to keep the block moving with constant velocity . The ratio coefficient of static and kinetic friction is

A block of mass 4 kg is initially at rest on a horizontal frictionless surface. A force vec(F) = (2x+3x^(2))hat(i) N acts horizontally on it. The maximum kinetic energy of the block between x = 2m and x=4m in joules is

A block of mass 1 kg in kept on a rough horizontal surface with mu_(s)=0.1 . A force of 0.5 N is applied as shown in the figure. What is the frictional force applied by ground on the block?

A block of mass 5 kg is at rest on a rough inclined surface. If angle of inclination of plane is 60^(@) , then force applied by it on block is

A block of mass 5kg is resting on a rough surface as shown in the figure. It is acted upon by a force of F towards right. Find frictional force acting on block when 25N.

A 2.5 kg block is initially at rest on a horizontal surface. A horizontal force vecF of magnitude 6.0 N and a vertical force vecP are then applied to the block (Fig. 6-31). The coefficients of friction for the block and surface are mu = 0.40 and mu = 0.25 . Determine the magnitude of the frictional force acting on the block if the magnitude of vecP is (a) 8.0 N. (b) 10 N, and (c) 12 N

NARAYNA-WORK , ENERGY & POWER -EXERCISE -II (H.W)
  1. When a bullet is fired a target, its velocity dwecreases by half after...

    Text Solution

    |

  2. A bullet of mass 10 gm is fired horizontally with a velocity 1000 ms^(...

    Text Solution

    |

  3. A block of mass 5 kg is initially at rest on a rough horizontal surfac...

    Text Solution

    |

  4. A block of mass m = 25 kg on a smooth horizontal surface with a veloci...

    Text Solution

    |

  5. A body freely falls from a certain height onto the ground in a time 't...

    Text Solution

    |

  6. The potential energy function for the force between two atoms in a dia...

    Text Solution

    |

  7. The variation of potential energy U of a body moving along x - axis va...

    Text Solution

    |

  8. The PE of a 2 kg particle, free to move along x-axis is given by V(x)=...

    Text Solution

    |

  9. Figure given below shows the variation of potential energy function U(...

    Text Solution

    |

  10. A ball is projected vertically down with an initial velocity from a h...

    Text Solution

    |

  11. A freely falling body takes 4s to reach the ground. One second after r...

    Text Solution

    |

  12. Two identical blocks A and B , each of mass m resting on smooth floor ...

    Text Solution

    |

  13. A body is thrown vertically up with certain initial velocity, the pote...

    Text Solution

    |

  14. A body is thrown vertically upward from a point A 125 m above the grou...

    Text Solution

    |

  15. A body of mass 10 kg dropped from a height 20 m, acquires a velocity o...

    Text Solution

    |

  16. A body slides down a fixed curved track that is one quadrant of a circ...

    Text Solution

    |

  17. AB is a frictionless inclined surface making an angle of 30^@ with hor...

    Text Solution

    |

  18. A ball of mass2 kg and another of mass 4 kg are dropped together from ...

    Text Solution

    |

  19. Which of the following graphs depicts the variation of KE of a ball bo...

    Text Solution

    |

  20. A man M(1) of mass 80 kg runs up a staircase in 15 s. Another man M(2)...

    Text Solution

    |