A projectile is launched at an angle θ above the horizontal.Three seconds later the projectile is moving the same angle θ below the horizontal.Which of the following (actual values with units,not just algebraic symbols)can be found from the information given?
A)the initial vertical component of the projectile's velocity
B)the initial horizontal component of the projectile's velocity
C)the initial magnitude of the velocity
D)None of the above since at least one of the above must be given to find the other two values.

Question

Quizplus · Accepted Answer

The initial vertical component of the projectile's velocity can be found because the time to reach the peak (where the vertical velocity is zero) is half of the total time given (1.5 seconds). Using the acceleration due to gravity (9.8 m/s^2), one can calculate the initial vertical velocity component.

A Projectile Is Launched at an Angle θ Above the Horizontal.Three