Question

What is the average velocity between 12.00 and 15.00 seconds?

A) 81.0 m/s, east

B)27.00 m/s, east

C)9.00 m/s, east
D)0.0123 m/s, east

Answer 1

Subtract d(15) - d(12), then divide that by 3 because 3 sec between 12-15:
(225-144)/3 = 81/3 = 27m/s
B) 27.00 m/s, east

Answer 2

Answer: The velocity of abject in a given time interval from 12 seconds to 15 sec is 27 m/s.

Explanation:

Displacement of the object after 12.00 seconds = 144 m

Displacement of the object after 15.00 seconds = 225 m

$Velocity=\frac{\text{Change in Displacement}}{\text{Change in time}}$

$Velocity=\frac{225 m-144 m}{15 s-12 s}=\frac{81 m}{3 s}=9m/s$

The velocity of abject in a given time interval from 12 seconds to 15 sec is 27 m/s.