Question

a child drops a coin from the top of a building which is 50m high calculate the velocity of the coin when it falls through 20m distance and the velocity with which the coin strikes the ground (g=9.8m/s²)​

Answer 1

Answer:

Explanation:

case 1

initial velocity (u)=0m/s

final velocity (v)=?

height=20m

acceleration(a)=10ms^-2

using equation,

2as=v²-u²

2*10*20=v²-0²

400=v²

v=20m/s

CASE 2

initial velocity (u)=20m/s

final velocity (v)=?

height=50-20=30m

acceleration (a)=10ms^-2

again by using equation,

2as=v²-u²

2*10*30=v²-20²

600=v²-400

v²=1000

v=32.14m/s