Question

The position (x) of body moving along x-axis at time (t) is given by x=3f^(2) where x is in matre and t is in second. If mass of body is 2 kg, then find the instantaneous power delivered to body by force acting on it at t=4 s.

Answer 1

Answer:

Given

$x = 3 {t}^{2} \\ \\ v = \frac{dx}{dt} = 6t \\ \\ a = \frac{d {}^{}v }{d {t}^{} } = 6 \\ \\ now \\ p = f.v = ma.v = 2 \times 6 \times 6t = 72t \\ \\ put \: t = 4 \: sec \\ p = 72 \times 4 = 288 \: watts$

Answer 2

Explanation:

sorry...

I don't know

..l.