A ball falls to the ground as shown below: What is the kinetic energy of the ball when it hits the ground?

Given: At 'A' potential energy = 80 J , kinetic energy = 0 J At 'C' Potential energy = 0 J Based on the conservation of mechanical energy, K . E i + P . E i = K . E f + P . E f 0 + 80 = K . E f + 0 ⇒ K . E f = 80 J So, the kinetic energy of the ball at C is 80 J . Note: As the ball falls towards the ground, its gravitational potential energy is transformed into kinetic energy. The kinetic energy of an object is the energy it possesses due to its motion. The kinetic energy of the ball will continue increasing as the ball gains momentum until it finally collides with a surface.

A ball falls to the ground as shown below: What is the potential energy of the ball at B?

Given, At 'A' potential energy = 80 J , kinetic energy = 0 J At 'B' kinetic energy = 48 J Based on the conservation of mechanical energy, K . E i + P . E i = K . E f + P . E f 0 + 80 = 48 + P . E f ⇒ P . E f = 32 J So, the potential energy of the ball at B is 32 J Note: Mechanical energy, which is the sum of kinetic and potential energy of an isolated system is always constant (considering absence of dissipative forces) .

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Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Questions Based on High Order Thinking Skills (HOTS)

Lakhmir Singh and Manjit Kaur Solutions for Chapter: Work and Energy, Exercise 20: Questions Based on High Order Thinking Skills (HOTS)

Author:Lakhmir Singh & Manjit Kaur

Lakhmir Singh Physics Solutions for Exercise - Lakhmir Singh and Manjit Kaur Solutions for Chapter: Work and Energy, Exercise 20: Questions Based on High Order Thinking Skills (HOTS)

Attempt the practice questions on Chapter 4: Work and Energy, Exercise 20: Questions Based on High Order Thinking Skills (HOTS) with hints and solutions to strengthen your understanding. Science for Ninth Class Part 1 Physics solutions are prepared by Experienced Embibe Experts.