the bullet of mass 10 g strikes a wooden block with a velocity of 300ms-1 after penetrating 20cm into it , its velocity drops to 200 ms-1. then average resistance offered by the block is
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- u=300 m/s
- v=200 m/s
- s=20 cm =0.2 m
- m= 10 gram=0.01 kg
3rd equation of motion is used:
- 2as =v²-u²
- retardation ,a=-125000ms²
- The resistant force =ma
- F=0.01*125000
- F=1250N
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