Question

A body of mass 5kg, initially at rest is subjected to a force of 20N. what is the kinetic energy acquired by the body at the end of a 10 seconds.​

Answer 1

$\large\underline{\underline{\sf Given:}}$

• Mass of body (m) = 5kg

• Force applies (F) = 20N

• Time (t) = 10s

$\large\underline{\underline{\sf To\:Find:}}$

• Kinetic Energy (KE) acquired by body = ?

$\large\underline{\underline{\sf Solution:}}$

According to Newton's second law :

$\large{\boxed{\sf F=ma }}$

$\large\implies{\sf a=\frac{20}{5}}$

$\large\implies{\sf a=4m/s^2 }$

According to first equation of motion :

$\large{\boxed{\sf v=u+at }}$

$\large\implies{\sf v=0+4×10 }$

$\large\implies{\sf v=40m/s}$

Hence ,

Kinetic Energy acquired by body :

$\large{\boxed{\sf KE=\frac{1}{2}mv^2}}$

$\large\implies{\sf \frac{1}{2}×5(40)^2}$

$\large\implies{\sf \frac{1}{2}×5×1600 }$

$\large\implies{\sf KE=4000J\:or\:4kJ}$

$\Large\underline{\underline{\sf Answer:}}$

•°• Kinetic Energy acquired by body is 4000J or 4kJ.

Answer 2

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