1.50 × 10³-kg car starts from rest and accelerates uniformly to 18.0 m/s in 12.0 s. Assume that air resistance remains con- stant at 4.00 × 10² N during this time. Find (a) the average power developed by the engine and (b) the instantaneous 12.0 s, just before the car power output of the engine at t = stops accelerating.

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57. A 1.50 × 10³-kg car starts from rest and accelerates uniformly
to 18.0 m/s in 12.0 s. Assume that air resistance remains con-
stant at 4.00 × 10² N during this time. Find (a) the average
power developed by the engine and (b) the instantaneous
power output of the engine at t = 12.0 s, just before the car
stops accelerating.
6
Transcribed Image Text:57. A 1.50 × 10³-kg car starts from rest and accelerates uniformly to 18.0 m/s in 12.0 s. Assume that air resistance remains con- stant at 4.00 × 10² N during this time. Find (a) the average power developed by the engine and (b) the instantaneous power output of the engine at t = 12.0 s, just before the car stops accelerating. 6
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