Question

A body moves such that its position varies with time according to $x\left(t\right)=3t^2$. What is its velocity at=3sec?

• A. 27 m/s
• B. 6 m/s
• C. 18 m/s
• D. -18 m/s

Answer 1

The correct option is C

18 m/s

$x\left(t\right)=3t^2$

$V\left(t\right)=\frac{dx}{dt}=6t$

Att = 3s, u = 18 m/s