A Boy Throws a Rock with an Initial Velocity of 2.15

Question 66
Multiple Choice

A boy throws a rock with an initial velocity of 2.15 m/s at 30.0° above the horizontal.If air resistance is negligible,how long does it take for the rock to reach the maximum height of its trajectory? A) 0.110 s B) 0.194 s C) 0.215 s D) 0.303 s