Question

. A toy scooter is having mass of 20 kg. It runs with a speed of 1 ms! What is the kinetic energy of the scooter ?​

Answer 1

Answer:

• Kinetic energy of body = 10 Joules

Explanation:

Given

• Mass of toy scooter, m = 20 kg
• velocity\speed of toy, v = 1 m/s

To find

• Kinetic energy of the scooter, K.E. =?

Formula required

• Formula required to calculate Kinetic energy

       K.E. = 1/2 m v²

[ Where K.E. is kinetic energy, m is mass and v is velocity of body ]

1. Kinetic energy is a scalar quantity.
2. SI unit of Kinetic energy : Joules (J)
3. 1 J = 1 kg m²/s²
4. Dimensional formula of KE : [ M¹ L² T⁻² ]

Calculation

Using formula to calculate Kinetic energy

→ K.E. = 1/2 m v²

putting values in RHS

→ K.E. = ( 1/2 ) · ( 20 ) · ( 1 )²

→ K.E. = ( 1/2 ) · ( 20 ) · ( 1 )

→ K.E. = 10 J

Therefore,

• Kinetic energy of the toy scooter would be 10 Joules.

Answer 2

$\bigstar$ Given

A toy scooter is having mass of 20 kg. It runs with a speed of 1 m/s

$\bigstar$ To Find

The kinetic energy of the scooter

$\bigstar$ Solution

We know that

$\red{\rm \longrightarrow K.E=\dfrac{1}{2}mv^{2}}$

Here

• K.E = kinetic energy
• m = mass
• v = velocity

Units

• K.E = Joule (J)
• m = kg
• v = m/s

According to the question

We are asked to find the kinetic energy of the scooter

Therefore

We must find "K.E"

Given that

A toy scooter is having mass of 20 kg. It runs with a speed of 1 m/s

Hence

• m = 20 kg
• v = 1 m/s

Substituting the values

We get

$\blue{\rm \longrightarrow K.E=\dfrac{1}{2} \times 20 \times (1)^{2} \ J}$

$\orange{\rm \longrightarrow K.E=\dfrac{1}{2} \times 20 \ J}$

$\green{\rm \longrightarrow K.E=\dfrac{20}{2} \ J}$

$\pink{\rm \longrightarrow K.E=10 \ J}$

Therefore

$\checkmark$ Kinetic Energy = 10 J