An coin is dropped vertically from the water surface in a swimming pool, water drag force is non negligible. The coin travels downward a vertical distance of 1.0 m, with approximately constant speed. The work done by drag force on the coin could either be positive or negative. is positive. O is zero. is negative.

An coin is dropped vertically from the water surface in a swimming pool, water drag force is non negligible. The coin travels downward a vertical distance of 1.0 m, with approximately constant speed. The work done by drag force on the coin could either be positive or negative. is positive. O is zero. is negative.