Question

A boy drops a coin from the top of building which is 49 m find the velocity with which the coin strikes the ground

Answer 1

Answer:

Answer is 31m/s

Explanation:

as the coin is being dropped, u=0

given height is 49m

so from the kinematic equations,

h=1/2 gt²

49 = 1/2 × 9.8 × t²

t²=10 ⇒t=√10

Now from the equation v=u+gt

v=0+ 9.8×√10

= 30.98≅ 31m/s

You can also do this problem directly by using the formula v²-u²=2gh

in both ways answer will be the samee....