Question

A ball is thrown vertically upward with initial velocity 100m/s. After how much time will it return

Answer 1

Total time of flight =2u/g

2×100/10 =200/10 =20 sec

Answer 2

Answer:

Displacement =0

Initial speed=100m/s

Acceleration =-10m/s2

From

S=ut +1/2at2

0 = 100t + 1/2(-10)t2

0 =100t - 5t2

0 = 5t(20 - t)

So,

t = 0, 20s

So it will take 20s to reach the ground

Explanation:

hope this helps you.