Home
Class 9
PHYSICS
The velocity of a particle at an instant...

The velocity of a particle at an instant is 10 m/s. After 5 s, the velocity of the particle is 20 m/s. The velocity at 3 s before the instant when the velocity of the particle was 10 m/s is

A

8 m/s

B

6 m/s

C

4 m/s

D

7 m/s

Text Solution

Verified by Experts

The correct Answer is:
C
`v = u + at`
`20 = 10+ a xx 5`
`implies a = 2`
`10 = u + 2 xx 3`
`implies u = 10 - 6 = 4`
Promotional Banner

Topper's Solved these Questions

  • DESCRIPTION OF MOTION

    CENGAGE PHYSICS|Exercise CONSOLIDATED EXERCISE (MULTIPLE-CHOICE QUESTIONS WITH ONE OR MORE THAN ONE CORRECT ANSWER)|6 Videos

  • DESCRIPTION OF MOTION

    CENGAGE PHYSICS|Exercise CHALLENGING EXERCISE|6 Videos

  • DESCRIPTION OF MOTION

    CENGAGE PHYSICS|Exercise CONSOLIDATED EXERCISE (MATCH THE COLUMNS)|3 Videos

  • ELASTICITY

    CENGAGE PHYSICS|Exercise OLYMPIAD AND NTSE LEVEL EXERCISES|10 Videos

Similar Questions

Explore conceptually related problems

The velocity of a particle at an instant is 10m/s. After 5sec, the velocity of the particle is 20m/s. Find the velocity at 3 seconds before from the instant when velocity of a particle is 10m/s.

The velocity of a particle at an instant is 10 m s^(-1) . After 3 s its velocity will becomes 16 m s^(-1) . The velocity at 2 s, before the given instant will be

The velocity of A at an instant is 4 m//s rightwards. Then the velocity of block B is

The velocity of a particle moving with constant acceleration at an instant t_(0) is 10m//s After 5 seconds of that instant the velocity of the particle is 20m/s. The velocity at 3 second before t_(0) is:-

A particle moves with a uniform velocity of 50 m/s for 20 min. What is the velocity of particle at t = 2 min ?

. If the velocity of a particle is (10 + 2 t 2) m/s , then the average acceleration of the particle between 2s and 5s is

Five particles have speeds 1, 2, 3, 4, 5 m/s. The average velocity of the particles is (in m/s)

A particle performing S.H.M. about equilibrium position. Then the velocity of the particle is

The acceleration of a particle is given by the relation as a = -kv^(5//2) , where is a constant. The particle starts at x=0 with a velocity of 16 m/s, and when x = 6, the velocity is observed to be 4 m/s. Find the velocity of particle when x=5m and the time at which the velocity ofthe particle is 9 m/s.

CENGAGE PHYSICS-DESCRIPTION OF MOTION-CONSOLIDATED EXERCISE (MULTIPLE-CHOICE QUESTIONS WITH ONE CORRECT ANSWER)
  1. When a ball is released from a top of building the distance covered by...

    Text Solution

    |

  2. The ratio of the height from which two bodies are dropped is 3:7 respe...

    Text Solution

    |

  3. The velocity of a particle at an instant is 10 m/s. After 5 s, the vel...

    Text Solution

    |

  4. A car starts from rest and moves with a uniform acceleration for 2 s. ...

    Text Solution

    |

  5. A stone when thrown with a velocity of 5 m/s attains a maximum height ...

    Text Solution

    |

  6. An ant moves along a circular track of 6 m radius such that the arc of...

    Text Solution

    |

  7. A ball is dropped from a balloon which is rising up with a speed of 2 ...

    Text Solution

    |

  8. If a car travels 30 m and 26 m in its 7^(th) and 6th second of its tra...

    Text Solution

    |

  9. If a ball is thrown upward with a velocity of 6 m/s. The maximum heigh...

    Text Solution

    |

  10. If a body is thrown in air with an angle with horizontal. Then the pat...

    Text Solution

    |

  11. A ball is thrown vertically upward in air. When the particle is at a h...

    Text Solution

    |

  12. Which of the graph shows that the particle is at rest .

    Text Solution

    |

  13. A particle travels half of the circle of radius r. Then the displaceme...

    Text Solution

    |

  14. A ball is dropped from a certain height to fall under gravity. After 1...

    Text Solution

    |

  15. The ratio of maximum height reached by two bodies projected vertically...

    Text Solution

    |

  16. Two trains 1000 m long are moving parallel to each other at a speed of...

    Text Solution

    |

  17. A car travels the first 1//3^(rd) distance at a speed of 30 km/h, the ...

    Text Solution

    |

  18. A bus starts moving with an acceleration 2 m//s^2. A cyclist 96 m behi...

    Text Solution

    |

  19. The velocity of car changes from 40 m/s to 10 m/s in 10 s. The acceler...

    Text Solution

    |

  20. Which of the graph shows a particle with retardation?

    Text Solution

    |