How much net work (in J) is required to triple her speed?
A 62.1 kg runner has a speed of 3.70 m/s at one instant during a long-distance event. The runner's kinetic energy is 425.07 Joules.
A 62.1 kg runner has a speed of 3.70 m/s at one instant during a long-distance event. The runner's kinetic energy is 425.07 Joules.
?
Kinetic enregy depends on the square of the velocity, so to raise the speed to its triple value, the
kinetic energy increases by a factor of 3² = 9.
The net work required is therefore 8 times the original kinetic energy