Projectile Motion Angular Position · PhysicsBowl 2017 #32

Physics · mechanics

Problem

A projectile is launched at an angle of 40° above the horizontal with a speed of

30 \frac{m}{s}

. How much time passes before the position of the projectile makes an angle of 20° above the horizontal from the original launch point? (Use

g = 10.0 \frac{m}{s^2}

) (A) 3.02 s (B) 2.38 s (C) 2.18 s (D) 1.93 s (E) 1.64 s