Question

a stone of mass 0.4 kg is projected upwards to a height 10 gram 10 metre per second calculate the potential energy of the stone at the highest point​

Answer 1

Answer:

${v}^{2} = 2as \\ {10}^{2} = 2 \times 10 \times h \\ h = \frac{100}{20} = 5 \: m$

Potential energy = mgh

= 0.4*10*5 = 20 J

Answer 2

Given

Mass = 0.4 kg

Height = 10 m

To Find

Potential Energy

Solution

We know that

→ PE = mgh

Here

• PE = Potential Energy
• m = Mass
• g = Accl. of gravity
• h = Height

Units

• PE = Joule (J)
• m = kilogram (kg)
• g = m/s²
• h = metre (m)

According to the question

We are asked to find potential energy

Therefore

We must find "PE"

Given that

Mass = 0.4 kg

Height = 10 m

Hence

• m = 0.4 kg
• h = 10 m

We already know that

• g = 10 m/s²

Substituting the values

We get

→ PE = 0.4 x 10 x 10 J

→ PE = 4 x 10 J

Therefore

→ PE = 40 J

Hence

Potential Energy = 40 J