The velocity of a 621-kg auto is changed from 10.0 m/s to 44.0 m/s in 70.2 s by

Question

The velocity of a 621-kg auto is changed from 10.0 m/s to 44.0 m/s in 70.2 s by an external, constant force.
(a) What is the resulting change in momentum of the car?
kg · m/s

(b) What is the magnitude of the force?
N

A 92-kg fullback, running at 5.0 m/s, attempts to dive directly across the goal line for a touchdown. Just as he reaches the line, he is met head-on in midair by two 73-kg linebackers both moving in the direction opposite the fullback. One is moving at 2.0 m/s, the other at 4.0 m/s. They all become entangled as one mass.


(a) What is the velocity of the football players after the collision? (Take the positive direction to be the initial direction of the fullback.)
m/s

Explanation / Answer

a>621*44-621*10=21114 b>change in momentum/time=21114/70.2=300.76 c>initial momentum=final momentum =>92*5+73*(-2)+73*(-4)=(92+73+73)*v (moving in opp direction means negetive velocity) =>v=.0924

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