# A bullet of 10 g strikes a sand bag at a speed of 103 ms-1 and gets embedded after travelling 5 cm. Calculate (i) the resistive force exerted by the sand on the bullet. (ii) the time taken by the bullet to come to rest.

Dear Student,

$Also,\phantom{\rule{0ex}{0ex}}v=u+at\phantom{\rule{0ex}{0ex}}0={10}^{3}+\left(-{10}^{7}\right)t\phantom{\rule{0ex}{0ex}}t=\frac{{10}^{3}}{{10}^{7}}={10}^{-4}sec$

Regards,

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## v2=u2+2as

0=(103)2+2×a×(5×10−2)
a=−107 m/s2

v=u+at
0=103−107×t
t=10−4 s

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