Question

a boy of mass 45 kg running 6 m/s jumps onto a 30 kg trolley moving in the same direction at 1.5 m/s. their common velocity will be​

Answer 1

Answer:

Mass of the boy , m

1

=50kg

Speed of boy,u

1

=5m/s

Mass of trolley m

2

=20kg

Speed of trolley u

2

=1.5m/s

Combined mass of boy and trolley, m=20+50=70kg

Combined velocity v

Acc.to the low of conservation of momentum

m

1

u

1

+m

2

u

2

=mv

50×5+20×1.5=70×v

v=

70

250+30

=4m/s

Step-by-step explanation:

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