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.

0.3x0.21x0.08kg=mass 1 sheet

mass 500 = 500xmass 1

volume pile = 0.3x0.2x0.048

density=mass/volume= 500xmass 1/0.3x0.2x0.048

v patient student