Question

A bicyclist was moving at a rate of 3 m/s, and then sped up to 4 m/s. If the

cyclist has a mass of 100 kg, how much work was needed to increase his
velocity? (Hint: Use the work-kinetic energy theorem.)
A. 1250J B. 800J C. 350J D. 450J

Answer 1

C. 350 J

Step-by-step explanation:

Work = change in energy

W = KE₂ − KE₁

W = ½ mv₂² − ½ mv₁²

W = ½ m (v₂² − v₁²)

W = ½ (100 kg) ((4 m/s)² − (3 m/s)²)

W = 350 J