a bullet fired with 200m/s retards with a rate of 2m/s2 and hits the wall after 20 seconds. the wall brings the bullet into rest in the next 5 seconds. then the retardation offered by the wall is: 30m/s2 31m/s2 32m/s2 34m/s2
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a bullet fired with 200m/s retards with a rate of 2m/s2 and hits the wall after 20 seconds. the wall brings the bullet into rest in the next 5 seconds. then the retardation offered by the wall is: 30m/s2 31m/s2 32m/s2 34m/s2
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Answer:
Initially for the bullet, u = 200m/s, v =? a= - 2 m/s2, t = 20s
Now, v = u + at
=> v = 200 + (-2)x20 = 160 m/s
Now, for wall, u = 160 m/s, v = 0, t = 5s
So, a = v-u/t = 0-160/5 = - 32 m/s
Hence, retardation offered by wall is 32 m/s