A compact car, mass 730 kg, is moving at 1.00 ✕ 102 km/h toward the east. The driver of the compact car suddenly applies the brakes hard for 1.9 s. As a result, an average force of 4.8 ✕ 103 N is exerted on the car to slow it down. What is the momentum now?

Answer 1

Vo = 100km/h = 100,000m/3600s. = 27.8 m/s.

a = F/m = -4800/730 = -6.58 m/s^2.

V = Vo + a*t = 27.8 - 6.58*1.9 = 15.3 m/s.

Momentum = m*V = 730 * 15.3 = 11,174