Question

A trolly of mass 50kg is moving with a velocity of 20m/s.A bag of mass 20kg is placed on the trolly gently.What is the speed of trolly with the bag ?

Answer 1

Answer:

0.7 m/s

Explanation:

momentum = m × v

m = mass = 50 kg

v = velocity = 20 m/ s

50 × 20 = 100 kg m/s

after the new mass

50 + 20 = 70 kg

70 × x = 100

x = 0.7 m/s