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Question

Calculate the work done A car of weight 20000N climbs up a hill at 8m/s speed. Gaining a height of120m in 100s.


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Solution

Step 1: Given data

Weight (w)=20000N

Speed (s)=8m/s

Height (h)=120m

Time (t)=100s

Step 2: Formula used

P=WT

P=Power

W=Work done

T=Time

Step 3: Determine the work done
Calculate the work done against gravity as,
Work done by the car = Weight of body ×Vertical distance
=20000×120J

=2400000

=2.4×106J

The work done a car of weight 20000N climbs up a hill at 8m/s speed. Gaining a height of 120m in 100s is 2.4×106J.


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