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A body projected vertically upwards with...

A body projected vertically upwards with a velocity u returns to the starting point in 4 seconds. If `g = 10m//sec`, the value of u is

A

5m/sec

B

10m/sec

C

15m/sec

D

20m/sec

Text Solution

Verified by Experts

The correct Answer is:
D
Time of flight = `(2u)/(g)`
`rArr 4 = (2u)/(10) rArr u = 20m//s`
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Knowledge Check

  • A body is projected vertically upwards with some velocity u . It at the same point at t = 6 s as was at t = 4 s . Find the value of u .

    A
    `30 m//s`
    B
    `40 m//s`
    C
    `20 m//s`
    D
    `50 m//s`

  • A player throws a ball vertically upwards with velocity u. At highest point,

    A
    both the velocity and acceleration of the ball are zero.
    B
    the velocity of the ball is u but its acceleration
    C
    the velocity of the ball is zero but its acceleration is g.
    D
    the velocity of the ball is u but its acceleration is g.

  • A body is thrown vertically upwards with a velocity u . Find the true statement from the following

    A
    Both velocity and acceleration are zero at its highest point
    B
    Velocity is maximum and acceleration is zero at the highest point
    C
    Velocity is maximum and acceleration is g downwards at its highest point
    D
    Velocity is zero at the highest point and maximum height reached is `u^(2)//2g`