Ablock of wood 3 cm on each side has a mass of 27
g. what is the density of the block

The roller coaster from problem #1 then tops a second hill at 15.0 m/s, how high is the second hill? 91.5 m 79.2 m 80.0 m 68.5 m

An open cart is moving along a straight frictionless horizontal track. when rain starts falling vertically into the cart, what happens to the speed of the cart?

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.