Solving Projectile Motion Using Energy Video Lessons

Example

# Problem: A football is kicked off the ground a distance of 50 yards downfield. Neglecting air resistance, which of the following statements would be INCORRECT when the football reaches the highest point?  (A) all of the balls original kinetic energy has been changed into potential energy  (B) the balls horizontal velocity is the same as when it left the kickers foot  (C) the ball will have been in the air one-half of its total flight time  (D) the ball has an acceleration of g  (E) the vertical component of the velocity is equal to zero

###### FREE Expert Solution

Kinetic energy:

$\overline{){\mathbf{K}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbf{2}}{{\mathbf{mv}}}^{{\mathbf{2}}}}$

The potential energy at height:

$\overline{){\mathbf{U}}{\mathbf{=}}{\mathbf{m}}{\mathbf{g}}{\mathbf{h}}}$

95% (307 ratings)
###### Problem Details

A football is kicked off the ground a distance of 50 yards downfield. Neglecting air resistance, which of the following statements would be INCORRECT when the football reaches the highest point?

(A) all of the balls original kinetic energy has been changed into potential energy

(B) the balls horizontal velocity is the same as when it left the kickers foot

(C) the ball will have been in the air one-half of its total flight time

(D) the ball has an acceleration of g

(E) the vertical component of the velocity is equal to zero