Question

plllzzz ans. 9th WITH out ANY LINk
9.A bullet of mass 30 g moving with a speed of 400 m s^-l penetrates 10 cm into a mud wall. What is the average force enerted by the wall On the bullet?

Answer 1

Dear student,

Mass of the bullet m = 30 g = 0.03 kg

Initial velocity of the bullet, u = 400 m/s

Final velocity of the bullet, v = 0 m/s

Distance travelled by the bullet = 10 cm = 0.10 m

$$\begin{gathered} v^2-u^2=2as \\ \frac{0-{\left(400\right)}^2}{2\times .10m}=a \\ \frac{-160000}{.20}=a \\ a=-8\times {10}^{5}m/s^2 \\ F=ma \\ F=0.03\times 8\times {10}^5=24000N \end{gathered}$$
Regards