Question

A body of mass 2kg is droped from a height of 20m . Find its initial momentum and the momentum just before it strikes the ground

Answer 1

Answer:

Initial Momentum = 0 kg m/s

Final Momentum =  40 kg m/s

Explanation:

s = 20m

u = 0 m/s

m = 4 kg

g = 10 m/s²

Initial Momentum = mu

= 2 × 0

= 0 kg m/s

v² - u² = 2as

v² - 0² = 2 × 10 × 20

v² = 400

v = √400

v = 20 m/s

Final Momentum = mv

= 2 × 20

= 40 kg m/s