Answer:
82.8 J
Explanation:
The work done to raise the crate is ...
PE = Mgh = (3 kg)(9.8 m/s^2)(2 m) = 58.8 J
The kinetic energy added to send the box flying is ...
KE = (1/2)Mv^2 = (1/2)(3 kg)(4 m/s)^2 = 24 J
So, the total work involved in this activity is ...
58.8 J +24 J = 82.8 J
