The distance xm travelled by a particle in time t seconds is described by the...
PHYSICS
JAMB 1997
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
- A. 60 ms-1
- B. 72 ms-1
- C. 84 ms-1
- D. 108 ms-1
Correct Answer: B. 72 ms-1
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
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