Question

calculate the potential energy possessed by a cricket ball 160g when it is at a height of 8m above the ground take the volume of g as 10m/sec with solution ​

Answer 1

Total energy at the time of projection

=½ mv² = ½ × 0.1 (20)² = 20 J

Half way up, P.E becomes half the P.E at the top i.e .

P.E .= 20/2 = 10 J therefore K.E. = 20 -10 = 10 J

Answer 2

Answer :

➥ The potential energy possessed by a cricket ball = 12.8 J

Given :

➤ Mass of a cricket ball (m) = 160 g

➤ Height (h) = 8 m

➤ Acceleration due to gravity (g) = 10 m/s²

To Find :

➤ Potential energy possessed by a cricket ball (P.E) = ?

Solution :

To find the potential energy possessed by a cricket ball, first we need tk convert the mass of a cricket ball (m) gram into kg, then after we find the potential energy possessed by a cricket ball from the potential energy formula.

◈ Mass (m) = 160 g = 160/1000 = 0.16 kg

As we know that

→ P.E = mgh

→ P.E = 0.16 × 8 × 10

→ P.E = 1.28 × 10

→ P.E = 12.8 J

Hence, the potential energy possessed by a cricket ball is 12.8 J.

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Some related formulae :

⪼ Kinetic energy = ½mv²

⪼ Potential energy = mgh

⪼ Work done = Force × Displacement

Where,

• m is the mass.
• v is the velocity.
• g is the acceleration due to gravity.
• h is the height.

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