GELSEY

A block of mass m having charge q is sliding down an inclined plane of inclination and coefficient of friction.When uniform electric field E is applied parallel to the base of inclined plane,the block slides down with constant velocity.The value of E is?

An aeroplane has to go from a city A to another city B 500 km away in which B is north of A.The wind is blowing towards east at a speed of 20m/s.The air speed of aeroplane is 40 m/s.The direction in which the pilot should head the plane to reach the point...