How much work must be done to stop a 1100 kg car traveling at 95 km/h ?
Answers
The work that must be done to stop an 1100 kg car travelling at 95 km/h is - 382.74 kJ.
Explanation:
The mass of the car, m = 1100 kg
The initial velocity of the car, u = 95 km/h =95 * [5/18] m/s = 26.38 m/s
Since the vehicle has to be stopped so, the final velocity will be v = 0.
Now, we know that
The work done to stop the car will be
= Kinetic energy possessed by the car
= [Final K.E.] – [Initial K.E.]
= [½ *mv²] – [½ *mu²]
Substituting the given values in the above formula, we get
= [½ *1100 * 0²] – [½ *1100 * (26.38)²]
= - 382747.42 J
= - 382.74 kJ
Thus, the work that is needed to be done to stop the car is -382.74 kJ.
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