If you jump upward (on Earth) with an initial velocity of 3 m/s, how long will will it take before you return to the ground? How high will you have gone?

If you jump upward (on Earth) with an initial velocity of 3 m/s, how long will will it take before you return to the ground?  How high will you have gone?

What is the gravitational potential energy of a 10 kg TV held 1 m off the ground?  10 m off the ground?  100 m off the ground?

You are moving a 100 kg refrigerator up a small staircase to a height of 1 m.  You use a ramp that is 10 m long.  What is the minimum amount of force along the ramp must you exert to push the refrigerator to the top?

A bolt requires 6 N m of torque to tighten.  Using a wrench with a handle 10 cm long, how much force must you exert to turn the bolt