Question

. Mike Powell holds the record for the long jump of 8.95 m, established in 1991. If he left the ground at an angle of 15°, what was his initial speed?

Answer 1

Answer:

13.3 m/s

Explanation:

The motion is a projectile motion. The horizontal distance travelled, called the range, is given by

$R = \dfrac{u^2\sin2\theta}{g}$

u is the initial speed, $\theta$ is the angle with the horizontal and g is acceleration of gravity.

$u = \sqrt{\dfrac{Rg}{\sin2\theta}}= \sqrt{\dfrac{8.95\times9.81}{\sin30^\circ}}=13.3 \text{ m/s}$