After hitting it across the ice with a hockey stick, a 0.2kg hockey puck increases its speed from 0 to 10m/s. If the average force that the stick exerts on the puck is 200 N, what is the distance that the force is exerted over?

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

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.