The conservation of linear momentum is one of the most important principles of p

Question

The conservation of linear momentum is one of the most important principles of physics. The law of conservation of momentum stats that if no net external forces act on a system, then, the linear momentum of that system is conserved In an experiment, a 14-g bullet with an initial speed of Vo- 100 m/s is fired into a 3-kg block at rest on a horizontal frictionless table of height D. The bullet embeds itself in the block and together the bullet/block slide off the table and land at a distance R away from the base of the table

Explanation / Answer

1) As the block slides across the table, no gravitational potential energy loss occurs as the table is horizontal and hence there is no height change. So, the kinetic energy is converted to heat.

Hence the fourth option is correct.

2) When the block is in air and falling down, its speed increases and so does the kinetic energy and momentum.

So third option is correct.

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