Projectile Launch Angle from Minimum Speed · PhysicsBowl 2016 #21

Physics · mechanics

Problem

1.94 s

after launch, a projectile in free fall achieved its minimum speed during flight. If that minimum speed was

15.0 \frac{m}{s}

, what was the projectile's initial angle of launch from the horizontal? (Use

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

) (A)

82.6°

(B)

52.3°

(C)

50.6°

(D)

39.4°

(E)

37.7°