A variable force of magnitude F(x) moves a body of mass m along the x-axis from x1 to x2. The net work done by the force in moving the body from x1 to x2 is 
where v1 and v2 are the body's velocities at x1 and x2. Knowing that the work done by the force equals the change in the body's kinetic energy, solve the problem.A 2-oz tennis ball was served at 160 ft/sec about (109 mph). How much work was done on the ball to make it go this fast? (To find the ball's mass from its weight, express the weight in pounds and divide by 
the acceleration of
gravity.)
A. 23 ft-lb
B. 46 ft-lb
C. 50 ft-lb
D. 100 ft-lb
Answer: C
You might also like to view...
Interpret the meaning of the slope and the y-intercept of the equation in terms of the conditions stated in the problem.The cost, in dollars, of a one-day car rental is given by 
where x is the number of miles driven.
A. $30 is the cost per day to rent the car and $0.16 is the cost per mile. B. $0.16 is the cost per day to rent the car and $30 is the cost per mile. C. $16 is the cost per day to rent the car and $0.30 is the cost per mile. D. $30 is the cost per day to rent the car and $16 is the extra cost for unlimited miles.
Find the required inverse and locate on the number line.Find the multiplicative inverse for - 5 and graph on the number line. 
A. 
B. 
C. 
D. 
For the given polar equation, write an equivalent rectangular equation.r cos ? = 8
A. 8y = 1 B. x = 8 C. y = 8 D. 8x = 1
Multiply. Assume that all variables represent nonnegative real numbers.(
+ 4)(
- 6)
A. -19 - 6 
+ 4 
B. -49 + 19 ? 
C. -19
D. -15 - 6 ? 