AP EAMCET · PHYSICS · Work Power Energy
A rifle bullet loses of its velocity in passing through a plank. The least number of such planks required just to stop the bullet is
- A
- B
- C
- D
Answer & Solution
Correct Answer
(D)
Step-by-step Solution
Detailed explanation
If u is the initial velocity of bullet then after passing through one plank the velocity became v=u-u25=24u25 Using kinematic equation for uniform acceleration motion, v2-u2=2as 24u252-u2=2as⇒2as=u2-625+576625⇒2as=-u249625 If n number of planks are required…
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