Question

A car of mass 600 kg is moving at a speed of 54 km h-1. Find its kinetic energy. ​

Answer 1

Answer:

67500Joule

Explanation:

KE=1/2mv square

=1/2×600×(15m/s )square

=300×225=67500joule

Answer 2

Given

• Mass = 600 kg
• Speed = 54 km/h

To Find

Kinetic Energy

Solution

We know that

$\sf \longrightarrow KE=\dfrac{1}{2}mv^{2}$

Here

• KE = Kinetic Energy
• m = Mass
• v = Velocity

According to the question

We are asked to find kinetic energy

Therefore

We must find "KE"

Given that

• Mass = 600 kg
• Speed = 54 km/h

Hence

• m = 600 kg
• v = 54 km/h = 15 m/s

Substituting the values

We get

$\sf \longrightarrow KE=\dfrac{1}{2} \times 600 \times (15)^{2} \ J$

$\sf \longrightarrow KE=\dfrac{1}{2} \times 600 \times 225 \ J$

$\sf \longrightarrow KE=\dfrac{1}{2} \times 135000 \ J$

Therefore

$\sf \longrightarrow KE=67500 \ J$

Hence

Kinetic Energy = 67500 J