Question

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

Answer 1

Given :-

• Mass = 2.5 kg

• Speed = 2 m/s

To Find :-

• Kinetic Energy

SoluTion :-

$\boxed {\boxed {\sf {\ Kinetic \ Energy =\dfrac{1}{2} mv^{2}}}}\\\\\\\\\\\sf {\to Kinetic \ Energy = \dfrac{1}{2} \times 2.5 \times 2^{2} }\\\\\\\sf {\to Kinetic \ Energy = \dfrac{1}{2} \times 2.5 \times 4 }\\\\\\\sf {\to Kinetic \ Energy = \dfrac{1}{2} \times 10 }\\\\\\\sf {\to Kinetic \ Energy = 5 \ J}$

Thus, Kinetic Energy = 5 J

Extra Information :-

⇒ The energy that an object possesses by virtue its motion is called Kinetic Energy.

⇒ Its SI Unit is Joule (J).

⇒ It depends on the mass and speed of an object.

Answer 2

Given ,

Mass of object (m) = 2.5 kg

Speed of object (v) = 2 m/s

As we know that ,

The amount of energy stored in an object due to its motion is called kinetic energy

Kinetic energy = (1/2) mv²

The SI unit of kinetic energy is joule

Thus ,

$\sf \mapsto Kinetic \: energy = \frac{1}{2} \times 2.5 \times {(2)}^{2} \\ \\\sf \mapsto Kinetic \: energy = 2.5 \times 2 \\ \\ \sf \mapsto Kinetic \: energy = 5 \: \: joule$

$\therefore \sf \underline{The \: kinetic \: energy \: is \: 5 \: joule </p><p>}$