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  • A man fires a bullet of mass 0.03 Kg with a speed of 60 m/s enters a wooden block and is stopped after a distance of 0.4 m. The average resistive force (in N) exerted by the block on the bulle

A man fires a bullet of mass 0.03 Kg with a speed of 60 m/s enters a wooden block and is stopped after a distance of 0.4 m. The average resistive force (in N) exerted by the block on the bullet is  

Option: 1

165


Option: 2

115


Option: 3

135


Option: 4

110


Answers (1)

best_answer

As we have learned

Conservation of Energy and Conservation of Mechanical Energy -

Accounting all forms of energy within isolated system

i.e. total energy remains constant.

- wherein

These all forms of energy includes mechanical energy,potential energy, heat ,sound ,light,electrical energy etc

 

 Total energy will be conserved 

Work done by stopping force = loss in K.E 

F \times 0.40 = \frac{1}{2} m [ v _{i}^{2}- v _{f}^{2}]

F \times 0.40 = \frac{1}{2} \times 0.03\times [ (60)^2-0]

F \times 0.40 = \frac{1}{2} \times 0.03\times 360 0

F = 135 N

 

 

 

 

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