Question

A car is travelling at a speed of 20m/s and has a mass of 1200 kg. How much kinetic energy does it have?​

Answer 1

Answer:

The kinetic energy is 240000 J.

Step-by-step explanation:

Given:

The car is travelling at the speed of = 20 m/s

Mas of the car = 1200 kg

To find:

Kinetic energy the car possesses.

Solution :

$\boxed{\sf{KE = \frac{1}{2}m {v}^{2} }}$

• m = 1200 kg
• v = 20 m/s

$\sf{\longrightarrow} \: KE = \dfrac{1}{2} \times 1200 \times ( {20)}^{2}$

$\sf{\longrightarrow} \: KE = 600 \times 400$

$\sf{\longrightarrow} \: KE = 240000\: J$

Kinetic energy = 240000 J

Therefore, the kinetic energy is 240000 J.

Answer 2

Answer:

Given :-

• A car is travelling at a speed of 20 m/s and has a mass of 1200 kg.

To Find :-

• What is the kinetic energy.

Formula Used :-

$\sf\boxed{\bold{\large{Kinetic\: Energy =\: \dfrac{1}{2}m{v}^{2}}}}$

where,

• m = Mass
• v = Velocity

Solution :-

Given :

• Mass (m) = 1200 kg
• Velocity (v) = 20 m/s

According to the question by using the formula we get,

$\implies$ $\sf Kinetic\: Energy =\: \dfrac{1}{2} \times 1200 \times {(20)}^{2}$

$\sf \implies Kinetic\: Energy =\: \dfrac{1}{2} \times 1200 \times 20 \times 20$

$\implies$ $\sf Kinetic\: Energy =\: \dfrac{1}{2} \times 1200 \times 400$

$\implies$ $\sf Kinetic\: Energy =\: \dfrac{1}{\cancel{2}} \times {\cancel{480000}}$

$\implies$ $\sf\bold{\pink{Kinetic\: Energy =\: 240000\: J}}$

$\therefore$ The kinetic energy is 240000 J .