A boy kicks a football from ground level with an initial velocity of 20 m/s at an angle of 30° above the horizontal. How long does it take for the ball to rise to the highest point of its trajectory?
A) 1.0 s
B) 1.8 s
C) 2.0 s
D) 3.5 s
E) 0.5 s

Question

Quizplus · Accepted Answer

The vertical component of the initial velocity is 20 m/s * sin(30°) = 10 m/s. The acceleration due to gravity is -9.8 m/s^2. The time it takes for the ball to rise to the highest point of its trajectory is given by:v = u + at0 = 10 m/s - 9.8 m/s^2 * tt = 10 m/s / 9.8 m/s^2 = 1.0 s

A Boy Kicks a Football from Ground Level with an Initial