Question

PLEASE HELP ASAP
A stone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. The stone rolls down 10 meters and comes to rest on a patch of moss. The gravitational potential energy of the stone on the moss is how many
joules. (Use PE = m × g × h, where g = 9.8 N/kg. )

Answer 1

Explanation:

The dimensions of the question are as follows :-

• The weight of the stone is 1.5 Kg
• The height is 10 metres (Since it rolled 10 meters down, and total was 20, so final height is 20-10 = 10 metres)
• The gravitational constant is g and given it to be taken as 9.8N/kg

We know the formula :-

$\sf{Potential \ Energy = m \times g \times h}$

• Where m is mass
• Where h is height
• Where g is acceleration due to gravity.

Now, we need to place the values accordingly.

$\sf{Potential \ Energy = m \times g \times h}$

$\sf{Potential \ Energy = 1.5 \times 9.8 \times 10}$

$\sf{Potential \ Energy = 147 \ J}$

So, 147 Joules is the required answer.

Another thing :-

Kinetic Energy = 1/2 mv²

• Where m is mass
• Where v is velocity.

These formulas are helpful in solving these questions.

Answer 2

Answer:

The potential energy of the stone is calculated as 147J.

Explanation:

Given values are -

m (mass of the stone) = 1.5kg

g (acceleration of gravity) = 9.8N/kg

h (height at which stone is present) = 10 m

Initial height was 20 m but it rolls down 10 m. Hence, now the height is 10 m.

The formula of P.E (Potential Energy) is mgh

P.E = 1.5⨯9.8⨯10 = 147

P.E is 147Nm or 147J

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