Calculate the amount of work needed to stop a car moving at a speed of 60km / hr with a 1500kg pile.
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Answer:
208.3 kilojoules
Explanation:
Work = Change in Kinetic energy
= Final Kinetic energy - Initial Kinetic energy
= 0 J - 0.5mv²
= -0.5 × 1500 kg × (60 kmph)²
= -750 kg × (60 × 5/18 m/s)²
= -208,333.333 joules
≈ -208.3 kJ
Negative sign indicates that work is done to decrease the velocity of car from 60 kmph to 0 kmph.
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