Question

A boy on rollerskates is travelling along at 8 m/s. He has a mass of 60 kg and is carrying his

school bag of mass 10 kg. He throws the bag directly forward at 20 m/s relative to the
ground. Calculate the boy's speed after throwing the bag forward?

Answer 1

6m/s

Step-by-step explanation:

the original momentum = mass x velocity = 8x (60+10) = 560

momentum after = mass x velocity of the school bag + mass x velocity of the boy = 10x20 + 60x A

200+60A = 560

A=6