Question

A body is thrown with a velocity $9.8m{s}^{-1}$ making an angle of ${30}^{\circ }$ with the horizontal. It will hit the ground after a time.

• A. $3.0s$
• B. $2.0s$
• C. $1.5s$
• D. $1s$

Answer 1

Answer: (D)

$1s$

Time of flight: $T=\frac{2u\sin \theta }{g}$

$=\frac{2\times 9.8\times \sin {30}^{\circ }}{9.8}=2\times \frac{1}{2}=1sec$