Question

The speed of a vehicle of mass 500 kg is 18 km/h find its kinetic energy ​

Answer 1

Explanation:

first we convert 18km/h to SI unit

18 x 1000 / 60x60 m/s

= 18 x 5/18

= 5 m/s

and given mass = 500 kg

therefore, kinetic energy = 1/2 mv^2

= 1/2 x 500 x 5 x 5

= 6250 kg m/s^2

Answer 2

Given :

• Mass = 500Kg = m

• Velocity = 18 km/hr = v

To convert km/hr → m/s ..the velocity is to be multiplied by 5/18

$\mathsf{18 \times \frac{5}{18} } \\ \\ \boxed{\mathsf{5 m {s}^{ - 1} }}$

To find :

Kinetic Energy of the vehicle

Solution :

Application Used:

• $\mathsf{E _{k} = \frac{1}{2} m {v}}^{2} \\ \\ \\ \mathbb{SOLUTION} \\ \\ \mathsf{E_{k} = \frac{500 \times 5 \times 5}{2}} \\ \\ \boxed{\mathsf{ E _{k} =6250}}$

I hope it helps.