A 100 kg golf ball is moving to the right with a velocity of 20 m/s. It makes a head on collision with an 8 kg steel ball, initially at rest. The two balls get stuck together. What will the velocity of these two balls after collision?
Correct answer: C. 18.5 m/s
- A. 14.3 m/s
- B. 17.5 m/s
- C. 18.5 m/s
- D. 19.7 m/s
- E. 20.0 m/s
Explanation
Given: m1= 100 kg v1=20m/s m2=8kg v2= 0 Solution: After collision We know, Initial momentum=final momentum m1v1+m2v2= m1u1+m2u2 (100×20)+(8×0)=(100 + 8) u2 100×20=108 u2 u2=(100×20)/108 u2=18.5 m/s
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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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