Questions a-c refer to a toy car which is given a quick push so that it rolls up

Question

Questions a-c refer to a toy car which is given a quick push so that it rolls up an inclined ramp. After it is released, it rolls up, reaches its highest point, and rolls back down again. Friction is so small it can be ignored. Use one of the choices (A through G) to indicate the net force acting on the car for each of the cases described below. Answer choice J if you think that none is correct. The car is moving up the ramp after it is released. The car is at its highest point. Select The car is moving down the ramp. Select

Explanation / Answer

a) net force = Fnet = m*g*sin(theta)

m is the mass of the car

theta is the angle of inclination

So the answer is A) Net constant force down ramp

b) at the highest point the car reverses it's direction of motion then

momentarily it comes to stop

So the at the highest point

answer is : D) net force zero

C) Fnet = m*g*sin(theta)

then Net constant force down the ramp

So the answer is A) Net constant force down ramp

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