When a vehicle with a mass of 5t starts from a standstill and runs along a straight road with an acceleration of 1m / S2, the resistance of the vehicle is known to be 1000N. What is the traction force of the vehicle? What is the power of the car at the end of 10s? How much work does the external force do to the car during this period?
According to Newton's second law f-f = Ma: F = ma + F = 6000N, the speed at the end of 10s is: v = at = 1 × 10m / S = 10m / SP = FV = 6000 × 10W = 60kW, combined = 12mv2 = 12 × 5000 × 102J = 250000j. A: the traction force of the car is 6000N. The power of the car at the end of 10s is 60kW, combined with the external force in this period of time
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