Answer
The total mechanical energy is $~~0.080~J$
Work Step by Step
In part (b), we found that the maximum speed is $v_{max} = 4.0~m/s$
We can find the total mechanical energy:
$E = K+U$
$E = K_{max}+0$
$E = \frac{1}{2}~m~v_{max}^2$
$E = (\frac{1}{2})~(0.010~kg)(4.0~m/s)^2$
$E = 0.080~J$
The total mechanical energy is $~~0.080~J$
