Determine the distance from point C to the point on the horizontal surface D, if a ball is fired from a point A at the bottom of the inclined plane as shown in the figure. The mass of the ball is 4 kg ball and is of negligible size. The initial velocity of the ball is 20 m/s up the smooth inclined plane. Also, what is the velocity when it strikes the surface. 1) 36.9 m & 20
m/s 

Assuming the datum
at A and applying the principle of conservation of energy we have : The time taken for
the ball to travel from B to D can be found out by the following equation: So the time taken
for the ball to reach the point D is The distance travelled
by the ball horizontally to reach point D is given by the equation: So the distance travelled
by the ball horizantally to reach point D is d = 36.9 m Datum A : So the velocity with which the ball strikes the surface at D is v_{D} = 20 m/s and also the distance travelled by it from C to reach point D, d = 36.9 m
