# If a 2 kg object is constantly accelerated from 0m/s to 15 m/s over  12s, how much power musy be applied at t= 1 ?

Mar 8, 2018

$\text{18.75 watts}$ is the power constantly applied.

#### Explanation:

First, find the total energy at the end, in this case kinetic energy

1/2×"2kg"× ("15 m/s")^2 = "225 joules"

Then divide $\text{225 joules}$ by the time in seconds to get the average power in watts:

$\text{225 Joule"/"12 s" = "18.75 watts}$