A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?
A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Question

Quizplus · Accepted Answer

The correct answer is A because the projectile's horizontal velocity is constant, and the time it takes to reach the roof can be found using the vertical component of its velocity. The horizontal distance traveled is then simply the product of the horizontal velocity and the time of flight.

A Projectile Is Projected from the Origin with a Velocity