A truck that travels on a level road at 90km/h can be stopped by its brakes in distance of 27m.Calculate the velocity from which it can be brought to rest in the same direction when descending a hill with an angle of sin-1(1/25).

Calculate the power that will pull a mass of 160kg at a constant velocity of 7m/s down a plane which makes an angle of 13 degrees with the horizontal.The frictional force is 400N