Question

10 grams Bullet in inetially travelling at 200 metres per second penetrates 12cm into a wooden block then the average resistance of wooden block is?​

Answer 1

Answer:

1800 N

u=120m/s and v=0

s=12cm=0.12m and m=30g=0.03kg

a=

2s

v

2

−u

2

=

2×0.12

0−120

2

=−60000m/s

2

Force F=ma=0.03×60000=−1800N

(-ve sign shows that force is resistive in nature)

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Answer 2

u=120m/s and v=0

s=12cm=0.12m and m=30g=0.03kg

$a= </p><p> \frac{}{?} </p><p> −u </p><p>2</p><p> </p><p> </p><p> = 2× \frac{0.120}{1202} </p><p> </p><p> </p><p> =−60000m/s </p><p>2</p><p>$

Force F=ma=0.03×60000=−1800N

(-ve sign shows that force is resistive in nature)