work out the kinetic energy of a 2.5 kg remote-controlled car that is moving at 2 m/s.

The kinetic energy (KE) of an object can be calculated using the formula:

KE=12mv2KE=\frac{1}{2}mv^2KE=21​mv2

where:

• mmm is the mass of the object,
• vvv is the velocity of the object.

Given:

• mass m=2 kgm=2,\text{kg}m=2kg,
• velocity v=2 m/sv=2,\text{m/s}v=2m/s,

Calculating the kinetic energy:

KE=12×2 kg×(2 m/s)2=1×4=4 JKE=\frac{1}{2}\times 2,\text{kg}\times (2,\text{m/s})^2 =1\times 4=4,\text{J}KE=21​×2kg×(2m/s)2=1×4=4J

So, the kinetic energy of the remote-controlled car is 4 joules.