GUJCET 2015 Physics Solved Paper

An inclined plane of length 5.60m making an angle of 45∘ with the horizontal is placed in an uniform clectric field E=100Vm−1. A particle of mass 1‌kg and charge 10−2C is allowed to slide down from rest position from maximum height of slope. If the co-efficient of friction is 0.1 , the time taken by the particle to reach the bottom is_______.