Author Question: A force acting on an object moving along the x axis is given by Fx = (14x - 3.0x2) N where x is in ... (Read 99 times)

genevieve1028 · **on:** Jul 28, 2018

A force acting on an object moving along the x axis is given by Fx = (14x - 3.0x2) N where x is in m. How much work is done by this force as the object moves from x = -1 m to x = +2 m?
a. +12 J
b. +28 J
c. +40 J
d. +42 J
e. -28 J

Question 2

Positive work can be done
a. by friction on the tires when a car is accelerating without skidding.
b. by a spring when it launches a clown in the air.
c. by a hand throwing a ball.
d. by all of the above. e. only by (b) and (c) above.