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.How many foot-pounds of work does it take to throw a baseball 60 mph? A baseball weighs 5 oz, or 0.3125 lb.
A. 18 ft-lb
B. 1210 ft-lb
C. 563 ft-lb
D. 38 ft-lb
Answer: D
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A. undefined
B. 0
C. 2
D. - 
Solve the problem.A class has 10 boys and 12 girls. In how many ways can a committee of four be selected if the committee can have at most two girls?
A. 5665 B. 4620 C. 5170 D. 4410
Solve the problem.A retailer knows that n games can be sold in a month at a price given by P(n) = 
, in dollars per game. Assume that he buys each game for 
and sells every one that he buys. If he wishes to make a profit of at least 
per month on sales of this game, how many games must he sell each month?
A. 20 ? n ? 50 B. 20 ? n ? 30 C. 0 ? n ? 20 D. 15 ? n ? 25
Solve the problem.A restaurant has a capacity of 266 patrons. If the restaurant is 
full, how many patrons are at the restaurant?
A. 39 patrons B. 14 patrons C. 45 patrons D. 42 patrons