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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