The distance xm travelled by a particle in time t seconds is described by the equation x = 10 + 12t2, Find the average speed of the particle between the time interval t = 2s and t = 5s
- 60 ms-1
-
72 ms-1
- 84 ms-1
- 108 ms-1
The correct answer is: B
Explanation
speed = \(\frac{dx}{dt}\)\(\frac{dx}{dt}\) = 10 + 12t2
\(\frac{dx}{dt}\) = 24t
\(\frac{dx}{dt}\) =24 x 3
\(\frac{dx}{dt}\) = 72 ms-1