Question

A bullet moving with a velocity of 400m/s can penetrate a fix wooden block 5cm deep.The velocity of bullet when it has penetrated 3cm is.​

Answer 1

Answer:

APPLY V2=U2+2GS

Explanation:

3RD EQUATION OF MOTION

Answer 2

Answer:

V=252.98 m/s

Explanation:

Given that

Initial velocity of bullet ,u= 400 m/s

The final velocity of bullet will be zero(v=0) when it penetrate up to 5 cm.

Lets retardation offered by wooden block = a m/s²

We know that

v²=u²-2as

0 = 400² - 2 x 0.05 x a

a=16 x 10⁵ m/s²

Lets final speed of bullet is V when it  penetrate up to  cm.

V²=u²-2as

V² = 400² - 2 x 0.03 x 16 x 10⁵

V=252.98 m/s