Abrick of mass 5 kg is released from rest at a height of 3 m. how fast is it going when it hits the ground? acceleration due to gravity is g = 9.8 m/s2.

a. 9.9 m/s

b. 8.1 m/s
c. 7.2 m/s
d. 7.7 m/s

Speed of the ball when it hits the ground, v = 7.7 m/s

Explanation:

It is given that,

Mass of the brick, m = 5 kg

It is released at a height of, s = 3 m

We need to find the speed with which it hits the ground. It can be calculated using the third equation of motion as :

Here, a = g and u = 0

v = 7.668 m/s

or

v = 7.7 m/s

So, the velocity of the ball when it hits the ground is 7.7 m/s. Hence, this is the required solution.

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.

c

explanation: