Question

If a balll is throne vertically downwards from height of tower 100 meter . In how much time body will strike the ground . g= 10 m/s -2​

Answer 1

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Let the time after which the ball hits the ground is ‛t’.

Initial Velocity of ball (u) = 0m/s

Effective acceleration (a) = 10m/s^2

Height (h) = 100m

h = ut + 1/2×(a)(t)^2

100 = 0(t) + 1/2×(10)(t)^2

100 = 5t^2

5t^2 = 100

t^2 = 20

t = √20

t = 2√5

t = 4.47 sec

Hence, the ball strikes the ground after 4.47 sec it was released.

Answer 2

Answer:

10 m/s

Explanation: