Troy pushes on a car for 10 seconds, during which he applies an impulse of 300 kgm/s. What force does he apply to the car?

A. 0.033 N
B. 30 N
C. 3000 N
D. 300 N

Question

Troy pushes on a car for 10 seconds, during which he applies an impulse of 300 kgm/s. What force does he apply to the car?

 		A.	0.033 N
 		B.	30 N
 		C.	3000 N
 		D.	300 N

anonymous · Answer

i think it is C. 
im nto 100% 
is that correct? @douglaswinslowcooper

anonymous · Answer

F = change in momentum / time

(F)(time) = impulse  = (mass)(velocity) = 300 kg-m/s 

F = impulse/time = (300 kg-m/s)/(10s) = 30 kg-m/s^2 = 30N

Not B.

anonymous · Answer

you mean not C? @douglaswinslowcooper  
how would you convert kg-m/s^2 into N?

anonymous · Answer

Sorry, I meant not C. B is right, as you figured out.

anonymous · Answer

1 kg-m/s^2 = 1 J    they are equal

anonymous · Answer

alright, thanks!