Question

Find the change in kinetic energy of on object of mass 'M' traveling at 'v' change it velocity to 3'v'.Also find the percentage change in KE?​

Answer 1

Answer:

0.09%

Explanation:

KE initial - KE final= delta KE

1/2mv²-1/2mv²

"mass is same so we cancle it"

1/2(3v)²-1/2(v)²

9v²-v²

9v²=v²

9v²/v²

9 joule

in percentage

0.09

Answer 2

Kinetic Energy:

Explanation:

• Kinetic energy refers to a form of energy that an object or particle has due to its motion.
• In the given problem we have to find the change in kinetic energy of an object of mass 'M' traveling at 'v' change its velocity to 3've.

        $\frac{K.E_i_n_i_t_i_a_l}{K.E_f_i_n_a_l} =\frac{\frac{1}{2}mv^2 _i_n_i_t_i_a_l}{\frac{1}{2}mv_2_i_n_i_t_i_a_l }$

       

        $\frac{K.E_i_n_i_t_i_a_l}{K.E_f_i_n_a_l} =\frac{v^2}{(3v)^2}$

        $\frac{K.E_i_n_i_t_i_a_l}{K.E_f_i_n_a_l} = \frac{v^2}{9v^2}$

        $\frac{K.E_i_n_i_t_i_a_l}{K.E_f_i_n_a_l} = \frac{1}{9}$  

Kinetic energy changes by 9 times when velocity changes 3 times.