Question

A man has a box of mass 10 kg the energy of the box when the man runs with a constant velocity of 2m/s along with the box behind the bus is

Answer 1

The kinetic energy gained by the man is  20 J.

Explanation:

When the man runs with the box :

Mass "m"  =  10  k g  

With a velocity of V = 2 m/s  

It gains K.E as :

K.E =  1 /2 m v 2

=  1 /2  ×  10  ×  (2 )^ 2 =  20  J

Thus the kinetic energy gained by the man is  20 J.

Also learn more

Find out the kinetic energy of a car of mass 3000 kg Moving with a constant velocity of 60 km/hr ?

https://brainly.in/question/5638967

Answer 2

$\huge{\underline{\underline{\red{\mathfrak{AnSwEr :}}}}}$

Given :

• Mass of box (m) = 10 kg
• Velocity (v) = 2 m/s

_____________________

To Find :

• Kinetic Energy

_____________________

Solution :

We have formula for Kinetic Energy :

$\large {\boxed{\sf{K.E \: = \: \dfrac{1}{2} mv^2}}} \\ \\ \implies {\sf{K.E \: = \: \dfrac{1}{2} \: \times \: 10 \: \times \: 2^2}} \\ \\ \implies {\sf{K.E \: = \: \dfrac{1}{2} \: \times \: 10 \: \times \: 4}} \\ \\ \implies {\sf{K.E \: = \: \dfrac{1}{2} \: \times \: 40}} \\ \\ \implies {\sf{K.E \: = \: 20}} \\ \\ {\underline{\sf{\therefore \: Kinetic \: Energy \: is \: 20 \: J}}}$