An ideal spring has the spring constant k = 440. N/m. Calculate the distance this spring must be stretched from its equilibrium position for 25.0 J of work to be done.

A crate with a mass of 37.0 kg is pushed with a horizontal force of 150 N. The crate moves at a constant speed across a level, rough surface a distance of 5.95 m What is the work done (in J) by the 150 N force? J=? What is the coefficient of kinetic friction between the crate and the surface?

A box with a mass of 6.0 kg is accelerated from rest by force along a floor at a rate of 2.0 m/s^2 for 7.0 s. Determine the net work performed on the box.

A center throws a basketball m = 1 kg straight up with an initial speed of vo = 9.5 m's. He releases the ball at shoulder | height ho = 1.9 m. Let gravitational potential energy be zero at ground level. Give the total mechanical energy of the ball E in terms of maximum height h it reaches, the mass m, and the gravitational acceleration g. E= What is the height, hm in meters? 9 HOME