Question

A bullet is fired on a wall with a velocity of 100 m/s. If the bullet stops at a depth of 10 cm inside the wall, then the retardation provided by the wall is ?

Answer 1

Answer:

If the bullet stops at a depth of 10cm inside the wall, then find the retardation produced by the wall. Answer (a= -50000m/s)

Answer 2

Given :-

Initial velocity of bullet is 100m/s

Final velocity of bullet is 0m/s

Distance travelled by bullet is 10cm = 0.1m

To Find :-

Retardation [ Negative acceleration ]

Solution :-

❍ To calculate the acceleration we have to substitute the values in the third equation of motion ::  

v² = u² + 2as  

Where,  

• v is final velocity  
• u is initial velocity  
• a is acceleration  
• s is distance

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Finding acceleration :-

⤳  0² = 100² + 2as  

⤳  0² = 100² + [ 2a × 0.1 ]  

⤳  0² = 100² + 0.2a  

⤳  0 = 10000 + 0.2a  

⤳  0.2a = 0 - 10000  

⤳  0.2a = -10000  

⤳  a = -10000/0.2

⤳  a = -10000/2

⤳  a = -5000 m/s

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• Henceforth, the retardation is -5000m/s