How Do You Calculate Impulse and Force in a Rear-End Collision?

[DANIELLYMA]

A 75 kg man is sitting in his car at rest at the stoplight. He is rear-ended by another car and is accelerated to 3.0 m/s in 0.2s. What is the impulse on the man and his car?

I found the impuse on the man which was:

I = m(change v)

= 75(3.0 -0)
= 225 Ns

I found the Net force on the man:

Fnet = 225/change in time
=225/0.2s
=1125N

I also found acceleration which is 15 m/s^2

I'm stumped because I can't find a way to find the impulse of the man and the car without needing the mass of the car. Any help would be highly appreciated.

Thank you

 

[fliinghier]

are those the exact words of the problem?

perhaps the answer is in terms of m?