Question

please help!!

A single constant force is exerted on an object. The graph describes the objects energy. How much work was done to increase the speed of the object from 1.0 m/s to 3.0 m/s?

A: 1.5 J
B: 2.0 J
C: 4.0 J
D: 4.5 J

Answer 1

Answer:

C. 4.0 J

Explanation:

Work is equal to the change in kinetic energy or kinetic energy final - kinetic energy initial. 1/2 mv^2 is the equation for kinetic energy. SInce the mass is the same, you don't have to include it when solving. 1/2 times 1^2 = 1/2. 1/2 times 3^2 = 4.5. 4.5 - 0.5 = 4 J