Question

the speed of a motor bike decrases by 4 times.its kinetic energy will decrease by

Answer 1

Answer:

16 times

Explanation:

hope u get my point

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Answer 2

Given:

The speed of the motorbike decreases by 4 times

To find:

The decrease in the kinetic energy of the motorbike

Solution:

It is given that the speed of the bike decreases by 4 times.

Now we know that the kinetic energy of a body is

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

Where m is the mass of the body

and v is the velocity of the body

Now let us assume the initial kinetic energy of the bike was K.E 1

the final energy after an increase in velocity will be

K.E 2 = $\frac{1}{2}m(\frac{v}{4} )^2$

K.E 2 = $\frac{1}{16}$ x   $\frac{1}{2}mv^2$

K.E 2 = $\frac{1}{16}$( K.E 1)

Therefore the kinetic energy will decrease 16 times.