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CBSE Class 9 Answered

A bullet moving with 10m/s hits the wooden plank. The bullet is stopped, penetrates the plank 1 cm deep. What is the retardation of the bullet?
Asked by Topperlearning User | 28 Jan, 2014, 10:45: AM
answered-by-expert Expert Answer

Initial velocity, u = 10 m/s and final velocity, v = 0 (because bullet is stopped)

S = 1 cm = 0.01 m.
 
Use third equation of motion:
 
 
Negative sign shows that it is retardation.
Hence, the retardation of the bullet is 5000 m/s2.
Answered by | 28 Jan, 2014, 12:45: PM
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