Question

what will be the magnitude of change in momentum imparted by the floor to a ball of mass 1 kg if it falls from the height of 100 cm on the floor and rebound vertically upward with same speed?

Answer 1

Answer:

2.8kgm/s

Explanation:

m=1kg, h=100cm = 0.1m

use, v² = 2gh

v² = 2x9.8x0.1 = 1.96

v = √1.96 = 1.4m/s

change in momentum = mv-(-mv) = 2mv

= 2x1x1.4kgm/s = 2.8kgm/s.