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A body on the ground is acted on by a force of 10N at a...

Physics
JAMB 1998

A body on the ground is acted on by a force of 10N at a point P as shown in the fig above. What force is needed to stop the body from moving eastwards?

  • A. 5N in the direction of east
  • B. 5N in the diretion of west
  • C. 5V3N in the direction of west
  • D. 10N in the southwest direction
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Correct Answer: Option B
Explanation

The horizontal (eastward) component of the 10N force is = 10 cos60

→ 10 x 0.5 = 5N. 

The equilibrant force needed to stop the body moving eastward must act in exactly the
opposite direction. 

Therefore, the needed force is 5N in the direction of West

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