A 15-G Bullet Is Shot Vertically into an 2-Kg Block

question 31

Multiple Choice

A 15-g bullet is shot vertically into an 2-kg block.The block lifts upward 8.0 mm (see the figure) .The bullet penetrates the block and comes to rest in it in a time interval of 0.0010 s.Assume the force on the bullet is constant during penetration and that air resistance is negligible.The initial kinetic energy of the bullet is closest to

• A)21 J.
• B)14 J.
• C)10 J.
• D)0.0012 J.
• E)0.16 J.

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