a bullet of mass 1 kg moving with 200ms hits a wooden plank and emerge

1.	a bullet of mass 1 kg moving with 200ms hits a wooden plank and emerges out if the work done by planks on bullet is 500J calculate the emergent velocity of bullet
Answer» Answer: 197.5 m/s Explanation: Initial KINETIC energy of bullet = 0.5mv² = 0.5 × 1 kg × (200 m/s)² = 20000 J = 20 kJ Work done by plank = 500 J Energy left = 20000 J - 500 J = 19500 J From CONSERVATION of energy Final Kinetic energy of bullet = 19500 J Emergent velocity of bullet = v' 0.5mv'² = 19500 J v' = SQRT(19500 J / (0.5 × 1 kg)) = 197.5 m/s

a bullet of mass 1 kg moving with 200ms hits a wooden plank and emerges out if the work done by planks on bullet is 500J calculate the emergent velocity of bullet

Answer»

Answer:

197.5 m/s

Explanation:

Initial KINETIC energy of bullet = 0.5mv²

= 0.5 × 1 kg × (200 m/s)²

= 20000 J

= 20 kJ

Work done by plank = 500 J

Energy left = 20000 J - 500 J = 19500 J

From CONSERVATION of energy

Final Kinetic energy of bullet = 19500 J

Emergent velocity of bullet = v'

0.5mv'² = 19500 J

v' = SQRT(19500 J / (0.5 × 1 kg)) = 197.5 m/s

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a bullet of mass 1 kg moving with 200ms hits a wooden plank and emerges out if the work done by planks on bullet is 500J calculate the emergent velocity of bullet

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