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## Homework Statement

A number of k people standing on a stationary car. These people jump off with a velocity of v relative to the car one by one. Assume these people jump to the direction, what is the final speed V of the car.

## Homework Equations

initial momentum=final momentum

## The Attempt at a Solution

I tried to apply the formula a few times..and I get MV= kmv + m(V1+V2+...+V(k-1))

V1 means the velocity of the car after 1 people jump off. V(k-1) means the velocity of the car after k-1 people jump off.

But i can't simplify it...