Philip P. answered • 02/19/18

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An impulse is a force applied for a given time:

**F·Δt = Δp**

- F = applied force = -1250 newtons
- Δt = time the force is applied
- Δp = change in momentum

Solve for Δt. Note that the change in momentum is

**mv**where m is the car's mass = 1000 kg and v_{f}- mv_{i}_{f}and v_{i}are the car's final and initial speeds. Note that you must convert the speeds to m/s to be in consistent SI units.The work done is:

**W = F·d**

- W = work done
- F = applied force = -1250 N
- d = distance traveled while force is applied

The distance is:

**d = (1/2)(F/m)Δt**

^{2}+ v_{i}Δt- F = applied force = -1250 N
- m = car's mass = 1000 kg
- Δt = time force is applied = your answer from above
- v
_{i}= initial velocity = 81 km/hr converted to m/s