Question

I need help doing the work for this problem? please help me..This is pretty simple but I've never once touched physics before so if anyone could give me steps on how to figure this stuff out that would be great!
It is crash-test-dummy Ed's first day on the job. He (and his 50-kg mass) gets to try out the new 1,200-kg Porsche 911. Lucky Ed! He has to drive it into a brick wall. Unlucky Ed! But it's his job, so he does it.
The Porsche and Ed are moving 30 m/s when they collide with the wall, with an impulse time of 0.5 s.

1. What is the magnitude of their initial momentum?
2. What is the magnitude of their final momentum?
3. What is the magnitude of the impulse of the collision?

Answer 1

Do you know what momentum is ? and How its calculated?

Answer 2

Ll be back in a while ok!..

Answer 3

no i never understood the formulas and how to get the answers.

Answer 4

So look we have formula for momentum which is mass*velocity

Answer 5

so the dummy's mass is 50 kg and the car's is 1200? do wee add them together? and the velocity would be...... 30 m/s?? right?

Answer 6

1. We need to find initial momentum: so apply that formula m*v and we get 1200*v for Porche as long as we do not know what initial velocity is

Answer 7

dont we need to add the mass of the dummy to the mass of the Porche?

Answer 8

no we do not

Answer 9

wait for a while

Answer 10

okay what next?

Answer 11

look we get for initial 1200*V1-50*V2

Answer 12

but there should be given velocities

Answer 13

i think i got it. i went to yahoo answers and found out how to do it thank you :) for helping