Monument & Energy│Please Help!

Question

A car crashes and experiences an impulse of magnitude 5000 km/s. If the collision occurs in 0.01 s, what is the force the car experiences?

Remember that F =Δp/t where F = force, Δp = impulse, and t = time of collision

1. 500,000 N
2. 5,000 N
3. 50,000 N
4. 500 N

Answer 1

An impulse is typically given in units of Ns however, it CAN be given in units of kgm/s so IF we assume the impact is 5000 kgm/s (instead of 5000 km/s) then:

F =Δp/t where F = force, Δp = impulse, and t = time of collision so:

F = 5000/0.01 = 500,000 newtons