In an INELASTIC collision between two objects A) the momentum of each object is

Question

In an INELASTIC collision between two objects A) the momentum of each object is conserved. B) the kinetic energy of each object is conserved. C) the momentum of the system is conserved but the kinetic energy- of the system is not conserved. D) both the momentum and the kinetic energy of the system arc conserved. E) the kinetic energy of the system is conserved, but the momentum of the system is not conserved. 2) A 15-g bullet is shot vertically into a 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

Explanation / Answer

1)

By the definition of INELASTIC COLLISION

the collision in which ,the linear momentum of the system is conserved but not the kinetic energy of the system is conserved

So the correct option is C) the mopmentum of the system i conserved but the kinetic energy of the sytm is not conserved

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2) using law of conservation ofenergy

initial energy of the bullet = final energy of bullet + block

initial energy of the bullet = (M+m)*g*h = (2+0.015)*9.81*8*10^-3 = 0.16 J

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3) using law of conservation of momentum

0 = (45*0.375)+(60*v)

v = 0.281 m/s

So the correct answers are B) 0.281 m/s

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