A bullet initially moving with a velocity of 20 m/s strikesa target and comes to rest after penetrating a distance 10cm in the target . Calculate the retardation caused by the target .

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Solution

Initial velocity, u = 20 m/s
Final velocity, v = 0
Distance travelled, s = 10 cm = 0.1 m
Now, using,
v² = u² + 2as
=> 0 = 20² + (2)(a)(0.1)
=> a = -2000 m/s²
This is the acceleration of the bullet. So, the retardation is = 2000 m/s²

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A bullet initially moving with a velocity of 20 m/s strikesa target and comes to rest after penetrating a distance 10cm in the target . Calculate the retardation caused by the target .

Initial velocity, u = 20 m/sFinal velocity, v = 0Distance travelled, s = 10 cm = 0.1 mNow, using,v2 = u2 + 2as=> 0 = 202 + (2)(a)(0.1)=> a = -2000 m/s2This is the acceleration of the bullet. So, the retardation is = 2000 m/s2

Initial velocity, u = 20 m/s
Final velocity, v = 0
Distance travelled, s = 10 cm = 0.1 m
Now, using,
v² = u² + 2as
=> 0 = 20² + (2)(a)(0.1)
=> a = -2000 m/s²
This is the acceleration of the bullet. So, the retardation is = 2000 m/s²