Question

The energy of a system increases at a rate of 3.5 t + 6.2 t ², in joules. what is the instantaneous power at t= 3.1 s?

Answer 1

$W=3.5t+6.2t^2$

$P=dW/dt=3.5+13t$

$P(3.1)=3.5+13\cdot3.1=43.8\ (W)$ . Answer