Question

A ball is thrown vertically upwards. Its distance s from a fixed point
varies with time t according to the following graph. Calculate velocity
of projection of the ball.
(A) 10 m/s
(B) 20 m/s
(C) 30 m/s
(D) 50 m/s​

Answer 1

Answer:

The correct answer is A

10 m/s

Explanation:

v2=u2−2gh

As we know that velocity is the total distance covered in a certain period of time. v= d/t

where 'd' is distance and 't' is the time period.  

so applying this formula:

As we know that after reaching maximum height, the velocity of the ball becomes zero.

Here is the solution:

0=(10)2−2×10×h2

∴h=20020=10m/s