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

13.3 m/s

Step-by-step explanation:

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

`R = (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{(Rg)/(\sin2\theta)}= \sqrt{(8.95*9.81)/(\sin30^\circ)}=13.3 \text{ m/s}`