Question

A boy of mass 30kg jumps into a stationary cart with a horizontal
velocity of 5m/s. The mass of the cart is 10kg. What is his velocity as the
cart starts moving?

Answer 1

Answer:

ANSWER

Given : M

girl

=40 kg u

girl

=5 m/s M

cart

=3 kg

Initial velocity of cart u

cart

=0

Let the final velocity of cart be V.

Applying conservation of linear momentum : P

i

=P

f

Or M

girl

u

girl

+M

cart

u

cart

=(M

girl

+M

cart

)V

Or 40×5+3×0=(40+3)V

⟹ V=

43

200

m/s