SL21518 SL21518

05-11-2019
Physics

contestada

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

Respuesta :

MathPhys MathPhys

05-11-2019

Answer:

C. 350 J

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

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