In Figure a runaway truck with failed brakes is moving downgrade at 130 km/h just before the

Question:

In Figure a runaway truck with failed brakes is moving downgrade at 130 km/h just before the driver steers the truck up a frictionless emergency escape ramp with an inclination of 0 = 15o. The truck's mass is 1.2 x 104 kg.

(a) What minimum length L must the ramp have if the truck is to stop (momentarily) along it? (Assume the truck is a particle, and justify that assumption.) Does the minimum length L increase, decrease, or remain the same if

(b) The truck's mass is decreased and