7. a 1.0-kg box accelerates from rest in a straight line across a frictionless surface for 20. s as depicted in the force vs. time graph to the right. (a) find the time taken for the object to reach a speed of 5.0 m/s b)determine the boxes velocity at the 15s time

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

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The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e