find the amount of work which must be done to increase the velocity of an object of mass 8 kg from 36 km per hour to 72 km per hour
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am out of work must be done
given that. mass =8kg ,velocity1=36km/h
velocity2=72km/h
first step. 36×5/18=10m/s
72×5/18=20m/s
therefore work done = Ke2-ke1
1/2×8×20^2= 4×400=1600
for second :- 1/2×8×10^2=100×4=400
work done =1600-400=1200
given that. mass =8kg ,velocity1=36km/h
velocity2=72km/h
first step. 36×5/18=10m/s
72×5/18=20m/s
therefore work done = Ke2-ke1
1/2×8×20^2= 4×400=1600
for second :- 1/2×8×10^2=100×4=400
work done =1600-400=1200
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