A $$2$$ kg block of wood rests on a long table top. A $$5$$ g bullet moving horizontally with a speed of $$150$$ $$ms-1$$ is shot into the block and sticks to it. The block then slides $$2.7$$ m along the table top and comes to a stop. The force of friction between the block and the table is

Question

A $$2$$ kg block of wood rests on a long table top. A $$5$$ g bullet moving horizontally with a speed of $$150$$ $$ms-1$$ is shot into the block and sticks to it. The block then slides $$2.7$$ m along the table top and comes to a stop. The force of friction between the block and the table is

Infinity Learn · Accepted Answer

Velocity of block just after collision,                 $$v=5$$×$$10-3$$×$$1502+5$$×$$10-3$$                                  (from$$ conservation of linear $$momentum)                    $$=$$ $$0.374$$ $$ms-1Let$$ F be the force of friction, then work done against friction $$=$$ initial kinetic energyor         F×$$2.7=12$$×$$2.005$$×$$(0.374)2$$⇒$$F=0.052$$ N

A 2 kg block of wood rests on a long table top. A 5 g bullet moving horizontally with a speed of $150 {ms}^{- 1}$ is shot into the block and sticks to it. The block then slides 2.7 m along the table top and comes to a stop. The force of friction between the block and the table is

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A 2 kg block of wood rests on a long table top. A 5 g bullet moving horizontally with a speed of 150 ms-1 is shot into the block and sticks to it. The block then slides 2.7 m along the table top and comes to a stop. The force of friction between the block and the table is

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Ready to Test Your Skills?

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A 2 kg block of wood rests on a long table top. A 5 g bullet moving horizontally with a speed of $150 {ms}^{- 1}$ is shot into the block and sticks to it. The block then slides 2.7 m along the table top and comes to a stop. The force of friction between the block and the table is