Kim dropped a ball from a window, its initial velocity is 0 m/s as it is being dropped. The ball strikes the ground in 3.0 seconds. What is the velocity of the ball the instant before it hits the ground? Use acceleration due to gravity = 10 m/s 2 . a. 0 m/s b. 10 m/s c. 20 m/s d. 30 m/s
The velocity of the ball the instant before it hits the ground can be calculated using the following kinematic equation:
v = u + at
where:
v = final velocity
u = initial velocity (0 m/s)
a = acceleration due to gravity (10 m/s^2)
t = time taken to strike the ground (3.0 seconds)
Plugging in the values, we get:
v = 0 + 10 * 3
v = 30 m/s
Therefore, the velocity of the ball the instant before it hits the ground is 30 m/s.
The correct answer is d. 30 m/s.