A bullet enters a concrete block at s0 with an initial veloc

A bullet enters a concrete block at s=0 with an initial velocity v0 and subsequently embeds itself after a distance of s1. the velocity of this bullet during penetration can be expressed as v=v0-ks, where v is in ft/s and s is in ft. using values v0=900ft/s and s1=4in, 1) Calculate the acceleration of this bullet upon impact. 2) Calculate the time required for this bullet to penetrate a distance of s2=3in into the block.

Solution

The answer of following question is as follows.

The time required to this bullet to penetrate a distance into block is 7 sec.