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Average speed 1
Avg. speed = total distance / total time
Average speed 2
Avg. speed = initial speed + final speed / 2
Rate of change of speed
Final speed + initial speed / time taken
Avg. velocity 1
Avg.veolicty = total displacement / total time
Avg. velocity 2
Avg.velocity = initial + final / 2
Efficiency
Eff. = useful energy output / total energy input
Work done
W = force x distance
Power
Power = work / time