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quise2ross
21.07.2019 •
Physics
If a ball is thrown vertically into the air in the presences of air resistance, would you expect the time during which it rises to be longer or shorter than the time during if falls?
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Ответ:
The force exerted by the brakes is 14,400,000 N
Explanation:
Initial kinetic energy of truck = 72 MJ
Work done by the breaks, W = Force exerted by the brakes × Distance, D, the truck came to stop
The distance, D, in which the truck came to a stop is given as 5 meters
Given that the initial kinetic energy, KE of the truck that was reduced by the breaks = The work done by the brakes
We have;
W = ΔKE = Change in kinetic energy
ΔKE = Initial kinetic energy - Final Kinetic Energy
Initial kinetic energy, KE = 72 MJ
Final Kinetic Energy = 0 J (Truck stopped)
ΔKE = 72 - 0 = 72 MJ
Therefore we have;
Force exerted by the breaks = W/D = 72 MJ/5 = 14.4 MN. = 14,400,000 N.