Finding velocity and time for moving particle.
1. A particle moves along the x-axis with its position at time t given by x(t) = t3 - 2t + 4. Which of the following is the velocity at time t = 4?
a. 24
b. 46
c. 50
d. 60
2. An arrow is shot vertically upward. Its height p in feet above the ground after t seconds is given by p(t) = -16t2 + 160t + 384. How long does it take to reach its highest point?
a. 2 sec
b. 12 sec
c. 5 sec
d. 384 sec