An RC car starts from rest an accelerates to 8.1 m/s in a time of 1.2 seconds. What is the (assumed constant) acceleration of the RC car, in m/s2?

Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.

The process of a material going through a change of state from a gas to a liquid

What is the answer to these problems 30 pt