An object of mass m moves horizontally, increasing in speed from 0 to v in a time t. The power necessary to accelerate the object during this time period is: a: mv^2t/2
b: mv^2/2
c: 2mv^2
d: v sqrt /m2t
e: mv^2/2t

You want to move a heavy box with mass 30.0 kg across a carpeted floor. you pull hard on one of the edges of the box at an angle 30∘ above the horizontal with a force of magnitude 240 n, causing the box to move horizontally. the force of friction between the moving box and the floor has magnitude 41.5 n . what is the box's acceleration just after it begins to move