Question

Starting at time t = 0 s, a motorboat travels at a constant velocity of 12 m/s for 10 s. The motorboat then changes

speed over the next 5 s. At a time of t = 15 s, It reaches a speed of 18 m/s and travels at that speed for 45 s. Which
of the following must be true about the motorboat's motion?
O A. The instantaneous velocity at t = 61 s is 18 m/s.
B. The instantaneous velocity at t = 12.5 s is 15 m/s.
OC. The average velocity over the first 10 s is the same as the instantaneous velocity.
D. none of the above

Answer 1

C. The average velocity over the first 10 s is the same as the instantaneous velocity.

Step-by-step explanation:

Since the boat is traveling at a constant velocity of 12 m/s, its average velocity is also 12 m/s. At any point in time for the first 10 s it is traveling at 12 m/s.

So its instantaneous velocity = 12 = average velocity