A bullet is fired with a velocity of 150m/s. it penetrate a wood by 5cm and stops. find the retardation of the bullet and the time interval in which bullet stops.
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using the formula v^2=u^2-2as.
0=150^2-2a(0.05m)
=>0.1a=22500
=>a=225000m/s^2 retardation
for time v=u-at
0=150-225000t
=>t=150/225000=1/1500=0.00066sec
0=150^2-2a(0.05m)
=>0.1a=22500
=>a=225000m/s^2 retardation
for time v=u-at
0=150-225000t
=>t=150/225000=1/1500=0.00066sec
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