Question

A body of mass 10kg is moving with a speed of 40m/s. Find its kinetic energy.​

Answer 1

Answer:

8000 joules is the answer

Explanation:

K.E. = 1/2*m*v^2

K.E= 1/2 * 10* 40 * 40

K.E.= 8000 J

Answer 2

Answer:

Kinetic energy = 8000 J

Step by step explanation:

Given :

Mass of the body = 10 kg

Speed = 40m/s

To find :

The kinetic energy

Taken :

To find the kinetic energy use this formula -:

$\boxed{\sf{K.E.=\dfrac{1}{2}\:\times\:m{v}^{2}}}$

Where,

K.E. = Kinetic energy

m = Mass

v = Velocity

Solution :

$\leadsto\sf{K.E.=\dfrac{1}{2}\times10kg\times{40m/s}^{2}}$

$\leadsto\sf{K.E.=\dfrac{1}{2}\times10kg\times(40\times40)m/s}$

$\leadsto\sf{K.E.=\dfrac{1}{\cancel{2}}\times\cancel{10}kg\times1600}$

$\leadsto\sf{K.E.=5kg\times1600}$

$\leadsto\sf{K.E.=8000 J}$

So , the kinetic energy of the body 8000J