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My teacher taught the class some relationships between kinetic energy and gravitational potential energy. The relationship could be described as: Ek = -1/2Eg Ek = -Eg Et = 1/2Eg Et = Ek + Eg What I dont get are equations regarding Ek (kinetic energy) and Et(total energy). One equation says...

A tennis player serves a ball horizontally, giving it a speed of 24m/s from a height of 2.5m. the player is 12m from the not. The top of the net is 0.90m above the court surface. Would the ball clear the net and land on the other side? If so, how far above the net will the ball travel? please...

A football is placed on a line 25m from the goal post. The kicker kicks the ball directly toward the post, giving the ball an initial velocity of 21.0m/s [47deg above the horizontal]. The horizontal bar of the goal post is 3.0 m above the field. How far above or below the bar will the ball...