How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?

The work done to raise the crate is given by the formula W = mgh, where m is the mass of the crate, g is the acceleration due to gravity, and h is the height raised. In this case, W = (200 kg)(9.81 m/s^2)(2 m) = 3924 J. The power required is P = W/t, so P = 3924 J / 4 s = 981 W.