Ablock of mass 15 kg starts from rest and slides down a 20° angle inclined plane. the coefficient of kinetic friction is 0.3. after sliding a distance of 34cm, it contacts a spring of force constant 350 n/m. how far does the block compress the spring?

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