Answer:
C = 41.7kW
Explanation:
Data ;
Mass (M) = 1x10³kg
Initial velocity (u) = 0m/s
Final velocity (v) = 25m/s
Time (t) = 7.5s
Power = Work / time
Work = force * distance
acceleration = average velocity/ time
Acceleration = (25 - 0) / 7.5 = 3.3m/s²
Power = force * velocity (speed)
Average velocity = (25 - 0) / 2 = 12.5m/s
Force = mass * acceleration = 1x10³ * 3.3 = 3333.33N
Power = force * velocity
Power = 3333.33 * 12.5 / 41666.67W
Answer:
C. 41.7 kW
Explanation:
car's acceleration is the velocity difference over time: a = (v1 - v0)/t = (25 - 0)/7.5 = 3.3 m/s^2
The avg. power P = F * v
The avg. speed is thus v = (v0 + v1)/2 = (0 + 25)/2 = 12.5 m/s
F = m * a = 1*10^3 * 3.3 = 3,333 N
P = 3,333 * 12.5 = 41,667 W = 41.7 kW
