Please help asap! a shopper pushes a 5.32 kg grocery cart with a 12.7 n force directed at -28.7 below horizontal. a friction force of 8.33 n pushes back against the motion. what is the acceleration of the cart? (in m/s^2)

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?

The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. at which position does the boulder have the greatest kinetic energy? ab c d

Why does gravity have a lesser than grater effect on higher altitudes?