A long-jumper leaves the ground at an angle of \(20^{\circ}\) above the horizontal and at a speed of \(11 m / s\). How far does lift jump in the horizontal direction?
A. \(0.384 m\) B. \(7.94 m \) C. \(8.45 m\) D. \(0 m\)
Correct Answer:
Explanation
ow far he traveled in the horizontal direction is the horizontal displacement which is the range and it is given by $$ \begin{aligned} &R=\frac{u^{2} \sin 2 \theta}{g} \\ &R=\frac{11^{2} \times \sin 2 \times 20}{9.8} \\ &R=7.94 m \end{aligned} $$
