What force should be applied on a 10 kg body so that it moves down in a vacuum with an acceleration of 3 m/s2 ? (Take g=9.8 m/s2)
Correct answer: C. 68 N
- A. 42 N
- B. 46 N
- C. 68 N
- D. 53 N
- E. 58 N
Explanation
The question wants the object to only move down at 3 m/s2, we need to apply an upward force that would accelerate the object downwards at 9.8-3=6.8 m/s2. Using F=ma, where m = 10 kg and a = 6.8 m/s2, we find F to be 68 N upwards.
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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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