Question

If you throw a ball up with a velocity of 7 m/s, how long will it take for the ball to reach the top of its path?

A. 0.11 Seconds
B. 0.41 Seconds
C. 0.71 Seconds
D. 1.01 Seconds

Answer 1

Answer:

c. 0.71 [s]

Explanation:

To solve this problem we must use the following equation of kinematics.

$v_{f} =v_{o} -g*t$

where:

Vf = final velocity = 0 (because when the ball reaches the top, there is no movement)

Vo = initial velocity = 7 [m/s]

g = gravity acceleration = 9.81 [m/s²]

t = time [s]

Note: The negative sign of the equation means that the movement is againts the direction of the gravity acceleration.

$0 = 7 - (9.81*t)\\t = 0.713 [s]$