A Boy Throws a Rock with an Initial Velocity of

Multiple Choice

A boy throws a rock with an initial velocity of
At 30.0° above the horizontal.How long does it take for the rock to reach the maximum height of its trajectory if air resistance is negligibly small and g = 9.80 m/s²?

A) 0.160 s
B) 0.282 s
C) 0.313 s
D) 0.441 s