Bullets of 0.03 kg mass each hit a plate at the rate of 200 bullets per second with a velocity of 30 m/s. Their average force acting on the plate in "N" is:
Correct answer: B. 180
- A. 120
- B. 180
- C. 300
- D. 480
Explanation
Force equals rate of change of momentum: F = (mass per bullet × velocity × bullets per second) = 0.03 × 30 × 200 = 180 N. This assumes bullets stick or are brought to rest on impact.
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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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