Question

a girl of mass 40 kg jumps with a horizontally with a velocity of 5 M per second on to a stationary card with fractional less will the mass of the cartrs 3 kg what is her velocity is the card start moving agent that there is no external unbalanced force working in the horizontal direction

Answer 1

I hope you understand

Answer 2

Question :

A girl of mass 40 kg jumps with a horizontally with a velocity of 5 M per second on to a stationary card with fractional less will the mass of the cartrs 3 kg what is her velocity is the card start moving agent that there is no external unbalanced force working in the horizontal direction.

Answer :

Let v be the velocity of the girl on the card at the card start moving.

The total momenta of the girl and cart before the interaction

$= 40 \: kg \times 5 \: m \: s {}^{ - 1} + 3 \: kg \times 0 \: m \: s {}^{ - 1} \\ = 200 \: kg \: m \: s {}^{ - 1}.$

Total momenta after the Interaction

$= {40 + 3} \: kg \: \times v \: m \: s \: {}^{ - 1} \\ = 43 \: v \: kg \: m \: s {}^{ - 1}$

Now,

43 v = 200

v = 200 / 43

+ 4.65 m s ^ -1