Steel balls of mass=0.10kg are dropped from a height of ℎ=5.0m onto a smooth steel plate inclined at 45∘ to the vertical.
If the balls are dropped one at a time at a rate of n=100 s^-1, what is the average force on the plate? You may assume that the collisions between the ball and the plate are elastic and that each ball hits the plate only once.
I understand that all of the Gravitational potential energy is converted to kinetic energy mgh = 0.5mv^2 where v turns out to be 10g where g is 9.81ms^-2. But I cannot get the force exerted by the plate using Force x Time = Momentum
Any help would be appreciated