Question

A car with mass of 700 kg is moving with a speed of 20 m/s calculate the kinetic energy of a car

Answer 1

$kinetic \: energy \: = \frac{mv {}^{2} }{2} k$

mass (m) = 700 kg

velocity (v) = 20 m/s

$kinetic \: energy \: = \frac{700 \times 20 \times 20}{2}$

$= \frac{280000}{2}$

$= 140000$

so,

$kinetic \: energy \: = 140000 j$

$= 140kj$

I hope it was helpfull

thank you

Answer 2

formula is 1/2 m v square

Explanation:

m= 700 kg,

v=20 m/s

so,

= 1/2m v square

1/2 ×700 ×20× 20

= 140000