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Question: A weightlifter is1.5m tall and lifts up a 40kg mass off the ground to a height of 0.5m above his head. How much work is done?
The work done in lifting the weight can be calculated using the formula for work which is Work = Force x Distance. In this case, the force exerted is equal to the weight of the object. The weight of an object is given by the formula Weight = Mass x Gravity. Considering that the acceleration due to gravity is approximately 9.8 m/s², we can calculate the weight of the object as follows: Weight = 40kg x 9.8m/s² = 392N The distance that the weight is moved is 0.5m above the weightlifter's head. Thus, the work done in lifting the weight can be calculated as follows: Work done = Force x Distance = Weight x Distance = 392N x 0.5m = 196 Joules. So the work done by the weightlifter is 196 Joules.
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