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Ne4ueva [31]
3 years ago
9

Josh and Jake are both helping to build a brick wall which is 6 meters in height. They each lay 250 bricks, but Josh finishes th

is task in 3 hours while Jake requires 4.5 hours to complete his part. Who does more work, or do they both do the same amount? Who has more power? Explain.
Physics
1 answer:
Molodets [167]3 years ago
5 0
<span>Each laid 250 bricks but while Jake was still working, Josh was lounging in the shade. Josh has more power but that power was only on for 3 hours out of 4.5. Obviously Josh could get more done is less time as long as he keeps working. Jake will get the hang of it soon.</span>
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Someone pls answer this
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Answer:

<em>The speed of metal block B is 5 m/s after the collision</em>

Explanation:

<u>Law Of Conservation Of Linear Momentum </u>

The total momentum of a system of bodies is conserved unless an external force is applied to it. The formula for the momentum of a body with mass m and velocity v is  

P=mv.  

If we have a system of bodies, then the total momentum is the sum of them all

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m_1v_1+m_2v_2=m_1v'_1+m_2v'_2

The metal block A has a mass of m1=3.2 Kg and moves at v1=4 m/s. Metal block b has a mass of m2=1.6 Kg and is initially at rest v2=0.

After the collision occurs, block A moves at v1'=1.5 m/s. We need to calculate the speed of the metal block B. Solving for v2':

\displaystyle v'_2=\frac{m_1v_1+m_2v_2-m_1v'_1}{m_2}

Substituting the given values:

\displaystyle v'_2=\frac{3.2*4+1.6*0-3.2*1.5}{1.6}

\displaystyle v'_2=\frac{8}{1.6}

\displaystyle v'_2=5\ m/s

The speed of metal block B is 5 m/s after the collision

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