Question

When exiting the highway, a 1100-kg car is traveling at 22 m/s. the car's kinetic energy decreases by 1.4×105j the exit speed limit is 35 mi/h.?

Answer 1

I think you want to determine the exit speed?

You have to determine how much velocity was decreased by calculating it from the kinetic energy.

KE = (1/2)mv²
1.4 x 10^5 = (1/2)*(1100)v²
v² = 254.55
v =15.95 m/s

So the velocity reduces by 15.95 m/s. Subtracting this to the initial velocity: 22 - 15.95 = 6.05 m/s.

So, the final speed was 6.05 m/s.

I hope I was able to help :)