Question

Heena takes a bucket of mass 20kg from a height of 2m to 6m. Find the potential energy of the bucket.​

Answer 1

Answer:

1200 joules

Step-by-step explanation:

Potential energy = mgh

= 20 kg ×10 m/s2 × 6m

= 1200 kgm2/s2

= 1200 joules

Note:- Height is taken from the ground.

Answer 2

Given data:-

{ Potential energy due to gravity = P.E; Mass = m; Acceleration due to gravity = g (9.8 m/s²); Initial height = H1; Final height = H2; Change in height = ΔH }

Here,

—› m = 20 kg

—› H1 = 2 m

—› H2 = 6 m

—› g = 9.8 m/s² ( constant )

Solution:-

we use formula to find potential energy.

Formula :- Gravitational potential energy of a bucket (P.E) = mgh

Let, assume h = ΔH

First we need to find ΔH

—› Δ H = Final height - Initial height

—› Δ H = H2 - H1

—› Δ H = 6 - 2

—› Δ H = 4 m

Now, according to formula

—› P.E = mgΔH

—› P.E = 20 × 9.8 × 4

—› P.E = 196 × 4

—› P.E = 784 Joule

Hence, the potential energy of the bucket is 784 Joule.