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nasty-shy [4]
3 years ago
9

a track coach with a meter stick and a stopwatch is trying to determine if a student is walking with constant speed.he should...

Physics
1 answer:
Aleksandr [31]3 years ago
7 0
Give you a device that tracks your speed?
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A bullet with a mass of 5 gramsand speed of 560 m/sis fired horizontally atablock of wood with a mass of 2 kg. The block rests o
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Momentum is conserved if and only if sum of all forces which are exserted on system equals zero. In our situation there are only internal forces, so by Newton's third law their vector sum is 0.

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Kinetic energy of system at first: \frac{mv^2}{2}=784\;\textbf{J}. After: \frac{(m+M)\frac{m^2v^2}{(m+M)^2} }{2}=\frac{m^2v^2}{2(m+M)}\approx 1,96\; \textbf{J}. The secret is that other energy is in work of deformation forces (they in turn heat a bullet and a block).

Answer is A)

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3 years ago
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thanks me

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Read 2 more answers
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