A plastic ball in a liquid is acted upon by its weight and by a buoyant force. T

Question

A plastic ball in a liquid is acted upon by its weight and by a buoyant force. The weight of the ball is 2.6 N. The buoyant force has a magnitude of 4.4 N and acts vertically upward. At a given instant, the ball has zero velocity. At that instant, an external force acting on the ball imparts an acceleration of 3.0 m/s2 in the downward direction of the ball. The external force, including direction, is closest to:

. 9.6 N, upward

b. 1.8 N, upward

c. 1.8 N, downward

d. 9.6 N, downward

e. 2.6 N, downward

Explanation / Answer

balancing forces in downwards direction,

2.6 - 4.4 + F = (2.6/9.81) x 3

F = 2.6 N downwards

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