Question

22. A body of mass 50 kg has a momentum of 3000 kg ms.
energy of the body. () the velocity of the body.
23. A ball of mass 200 g falls from a height of 5 m. What will be its kinetic energy when it
just reaches the ground ? (
89.8 ms )
frictionless horizontal platform​

Answer 1

22. 60m/s

23. 10J

Explanation:

22. Momentum of moving object =mass *velocity

p=mv

3000=50*v

v=60m/s

23. a object falls from height it means it was at rest therefore it's initial velocity is zero

using Newton's third equation of motion for gravity

2as=v²-u²

2*10*5=v²

mass of ball=200g

m=200/1000kg

KE=1/2mv²

KE=1/2*200/1000*100

KE=10J