# Physics Impulse

This is the problem I am dealing with: "One of the functions of an automotive air bag is that it lengthens the collision time. Without an air bag, suppose the 100Ns impulse of a collision is taken up by a fairly rigid dashboard, requiring a time of 15 ms. Find the amount of force exerted on the passenger."

Up till this problem I have only dealt with problems using the equation F x Change in Time = Mass x Change in Velocity. This problem only gives me 2 of the 4 variables in that equation, so I am at a loss of how to figure it out. Please help!

• remember the definition of impulse; this lets you continue. – Arnold Neumaier Nov 18 '12 at 17:00

impulse = F * change in time

100 = F * 15