Question

If a track star runs down the runway in the high jump event faster, he will be able to jump to a greater height. This is explained by the conservation of energy. Which statement best explains this idea? A) A faster runner creates more energy during their jump. B) A faster runner can apply a greater force than a slower runner. C) The upward push on the jumper is equal to his downward push on the ground. D) The kinetic energy before the jump is converted to potential during the jump.

Answer 1

Answer:

Option D

Explanation:

The kinetic energy of a track star is given by the expression $\frac{1}{2} mv^2$, where m is the mass of track star and v is the velocity of track star.

The potential energy is given by the expression mgh , where h is the height of track star and g is acceleration due to gravity value.

By energy conservation theory, energy can neither be created or destroyed.

So a running track stars kinetic energy is converted to potential energy when he jumps.

        $\frac{1}{2} mv^2$ = mgh

                 $h=\frac{v^2}{g}$

                        h ∝ $v^2$

 So height reached increases when velocity of speed star increases.

 So the answer is the kinetic energy before the jump is converted to potential during the jump.

Answer 2

Answer:

d

Explanation: