Question

a boy with mass 50 kg running at 5 m/s jumps on to a 20 kg trolley travelling

Answer 1

Answer:

Using conservation of momentum

MV+mv = (M+m)v'

Where :

M- Mass of the boy - 50kg

m- mass of the trolley - 20kg

V- velcoity of the boy - 5m/s

v- velocity of the trolley-1.5m/s

v' - common velocity - x

(50+20) x=(50x5 +20x1.5)

x= 4m/s.

Hence, the common velocity of the 4m/s.