Home
Class 12
PHYSICS
Let vec(v) and vec(a) denote the velocit...

Let `vec(v)` and `vec(a)` denote the velocity and acceleration respectively of a body in one-dimensional motion.

A

`|vec(v)|` must decrease when `vec(a) lt 0`

B

Speed must increase when `vec(a) gt 0`

C

Speed will increase when both `vec(v)` and `vec(a)` are `lt 0`

D

Speed will decrease when `vec(v) lt 0` and `vec(a) gt 0`

Text Solution

Verified by Experts

The correct Answer is:
C, D
Promotional Banner

Topper's Solved these Questions

  • KINEMATICS, FORCES

    D MUKHERJEE|Exercise Revision Exercise|26 Videos

  • KINEMATICS, FORCES

    D MUKHERJEE|Exercise Revision Exercise|26 Videos

  • IIT QUESTIONS 5

    D MUKHERJEE|Exercise Matrix matching type|2 Videos

  • MISCELLANEOUS QUESTION 1

    D MUKHERJEE|Exercise Miscellaneous Questions-1 (Straight-Objective Type)|54 Videos

Similar Questions

Explore conceptually related problems

Let v and a denote the velocity and acceleration respectively of a body.

Let v and a represent instantaneous velocity and acceleration of a particle respectively.

Let vec(C)=vec(A) +vec(B) :

A system of particles is free from any external force vec v and vec a be the velocity and acceleration of the centre of mass, then it necessarily follows that :

Particle A of mass m_1 moving with velocity (sqrt3hati+hatj)ms^(-1) collides with another particle Bof mass m_2 which is at rest initially. Let vec(V_1) and vec(V_2) be the velocities of particles A and B after collision respectively. If m_1 = 2m_2 and after collision vec(V_1) - (hati + sqrt3hatj)ms^(-1) , the angle between vec (V_1) and vec (V_2) is :

Let vec(C )= vec(A)+vec(B) then

Let vec(a) and vec(b) be the position vectors of A and B respectively. If C is the point 3 vec(a)-2vec(b) , then which one of the following is correct?

Position of particle as a function of time is given as vec r=cos wt hati+sin wt hatj . Choose correct statement about vecr,vec v and vec a where vec v and vec a are velocity and acceleration of particle at time t.

Let vec(a) and vec(b) be the position vectors of A and B respectively. If C is the point 3 vec(a) - 2vec(b) , then which one of the following is correct?

D MUKHERJEE-KINEMATICS, FORCES-Type 2
  1. Which of the following statements are true for a moving body ?

    Text Solution

    |

  2. Let v and a denote the velocity and acceleration respectively of a bod...

    Text Solution

    |

  3. Let vec(v) and vec(a) denote the velocity and acceleration respectivel...

    Text Solution

    |

  4. The figure shows the velocity (v) of a particle ploted against time (t...

    Text Solution

    |

  5. A particle of mass m moves on the x- axis as follows : it starts fro...

    Text Solution

    |

  6. The displacement (x) of particle depends on time (t) as x = alpha t^...

    Text Solution

    |

  7. A particle moves with an intial velocity v(0) and retardation alphav, ...

    Text Solution

    |

  8. A particle starts from the origin of coordinates at time t = 0 and mov...

    Text Solution

    |

  9. In the figure, the pulley P moves to the right with a constant speed u...

    Text Solution

    |

  10. In the figure, the blocks are of equal mass. The pulley is fixed. In t...

    Text Solution

    |

  11. Two paricles A and B start simultaneously from the same point and move...

    Text Solution

    |

  12. Two particles are projected from the same point with the same speed at...

    Text Solution

    |

  13. A cart moves with a constant speed along a horizontal circular path. F...

    Text Solution

    |

  14. A man on a moving cart, facing the direction of motion, thrown a ball ...

    Text Solution

    |

  15. A small ball is connected to a block by a light string of length l. Bo...

    Text Solution

    |

  16. A large rectangular box ABCD falls vertically with an acceleration a. ...

    Text Solution

    |

  17. A railway compartment is 16m long, 2.4 m wide and 3.2 m high. It is mo...

    Text Solution

    |

  18. The upper end of the string of a simple pendulum is fixed to a vertica...

    Text Solution

    |

  19. Two shells are fired from a cannot with a speed u each, at angles of ...

    Text Solution

    |

  20. A man who can swim at a speed v relative to the water wants to cross a...

    Text Solution

    |