Grant accelerates a 1 kg ball 5.0 m/s2 horizontally. The vertical acceleration o

Question

Grant accelerates a 1 kg ball 5.0 m/s2 horizontally. The vertical acceleration of the ball is zero. The force of

gravity is the only external force acting on the ball other than the forces Grant exerts on it.

a. How large is the horizontal force Grant exerts on the ball at this instant to cause its 5.0 m/s2 horizontal

acceleration?

b. How large is the vertical force Grant exerts on the ball at this instant?

answer: a. 5.0 N horizontal force in same direction as acceleration

b. 9.81 N upward

answers provided, please provide workout steps/explanation.

Explanation / Answer

Part A)

Apply F = ma

F = (1)(5)

F = 5 N horizontally in the direction of the motion

Part B)

W = mg = 1(9.8)

W = 9.8 N (the weight of the object)

Since it is the weight, the force must be applied upward to hold it up.

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