Question

Calculate the kinetic energy in joules if a ball of mass 40g moving at a velocity of 4m/s

Answer 1

Answer:

K.E= 1/2m v2

= 1/2 ×0.04(4)2

=1/2×0.04×16

= 0.32joule

Answer 2

The kinetic energy is 0.32 Joules.

Step-by-step explanation:

Given : A ball of mass 40 g moving at a velocity of 4 m/s.

To find : Calculate the kinetic energy in joules ?

Solution :

The kinetic energy formula is given by,

$\text{K.E}=\frac{1}{2}mv^2$

where, v is the velocity v=4 m/s

m is the mass m=40 g

Convert g into kg,

$1\ g=0.001\ kg$

$40\ g=0.001\times 40\ kg$

$40\ g=0.04\ kg$

Substitute the values,

$\text{K.E}=\frac{1}{2}\times 0.04\times 4^2$

$\text{K.E}=0.02\times 16$

$\text{K.E}=0.32\ J$

Therefore, the kinetic energy is 0.32 Joules.

#Learn more

A mass of 3kg is moving with velocity of 18km per hr calculate kinetic energy of the mass in joule

https://brainly.in/question/2146827