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Mass of boll =10gm Velocity of ball =25 m/s Mass of wall =70 kg Collid

Mass of boll Velocity of ball Mass of wall Collide lime Velocity of return =?

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hapter 11 In the previous few chapters we have talked draws diagrams, organises her thoughts, about ways of describing the motion of collects question probers, with her friends, and objects, the cause of motion and gravtand and performs experiments. She expends a lot of Another concept that hidps is unders and is work: energy on these activities. In common Closely related to work are energy and power. parlance, she is wworking itlerds. Al invelve very little 'work' if we go by In this chapter we shall study these concepts. Work' may involve very lithe works. All living beings need food. Living beings the You are working hard to push a huge rock. have to perform several basic activities Io Let us say the rock does not move despite all survive. We call such activities 'ife comes from the effort. You get completely exhausted, food. We need energy for other activities like However, you have not done any work on the playing, singing, reading, writing, thinking. rock as there is no displacement of the rock. jumping, cycling and running. Activities that You stand still for a few minutes with a are strenuous require more energy. Animals too get engaged in activities, For bit of your energy. Are you doing work on the example, they may jump and rum. They have bight, move away from enemies. find food load? The way we understand the term work' or find a safe place to live. Also, we engage in sclence, work is not done. some animals to lift weights, carry loads, pull You climb up the steps of a staircase and carts or plough fields. All such activities reach the second floor of a building just to require energy. see the landscape from there. You may even Think of machines. List the machines that climb up a tall tree. If we apply the scientific you have come across. What do they need for definition, these activities involve a lot of work. their working? Why do some engines require In day-to-day life, we consider any useful fuel like petrol and diesel? Why do living physical or mental labour as work. Activities beings and machines need energy? like playing in a field, talking with friends. 11.1 Work humming a tune, watching a movie, attending What is work? There is a difference in the be work. What constitutes 'work' depends way we use the term 'work' in day-to-day life on the way we define it. We use and define the term work differently in science. To activities: 11.1.1 NOT MUCH 'wOrK' IN SPITE OF Activity WORKING HARD! Kamall is preparing for examinations. She spends lot of time in studies. She reads books. We have discussed in the above paragraphs a number of activities which we normally consider to be work
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Question Text
Mass of boll Velocity of ball Mass of wall Collide lime Velocity of return =?
Updated OnJun 22, 2023
TopicPhysics
SubjectScience
ClassClass 9
Answer Type Video solution: 1
Upvotes91
Avg. Video Duration4 min