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September 17, 2014

September 17, 2014

Posted by **Anonymous** on Sunday, December 23, 2012 at 7:40pm.

of wood at rest on a horizontal surface and

stays inside. After impact, the block slides

15 m before coming to rest.

The acceleration of gravity is 9.8 m/s

2

.

If the coeﬃcient of friction between the

surface and the block is 0.7, ﬁnd the speed of

the bullet before impact.

Answer in units of m/s

- Physics -
**drwls**, Monday, December 24, 2012 at 7:26pmThe kinetic energy of the (bullet+block) after impact equals the work done against friction at the point where it stops. Solve for the velocity right after impact, V'. Then use conservatiuon of momentum to solve for the bullet velocity, V.

(1/2)(m+M) V'^2 = (m+M)*Mu*g*X

V' = 14.35 m/s

m*V = (m+M)*V'

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