How much work does a student (m = 60 kg) do when he Climb a tower 80 m high?

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.

What kind of waves require a medium to travel? question 6 options: light waves mechanical waves all waves need a medium to travel electromagnetic waves