Question

Calculate the kinetic energy in joules of a ball of mass 40g moving at a velocity of 4ms-1

Answer 1

Answer:

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Explanation:

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 joule ?

Solution :

The kinetic energy formula is given by,

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

2

1

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\ kg1 g=0.001 kg

40\ g=0.001\times 40\ kg40 g=0.001×40 kg

40\ g=0.04\ kg40 g=0.04 kg

Substitute the values,

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

2

1

×0.04×4

2

\text{K.E}=0.02\times 16K.E=0.02×16

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

Therefore, the kinetic energy is 0.32 Joules.