Abicyclist was moving at a rate of 8 m/s, and then sped up to 10 m/s. if the cyclist has a mass of 120 kg, how much work was needed to increase his velocity? (hint: use the work-kinetic energy theorem.)

Work = 2160 J

Explanation:

As per work energy theorem we know that work done is equal to the change in the kinetic energy of the cyclist.

As the cyclist is initially moving at speed 8 m/s and after some time his speed changes to 10 m/s

So here we can say that

final kinetic energy - initial kinetic energy = work done

now by plug in all values

so work done by cyclist will be 2160 J

15.3 cos 65 degrees trig