Answer:
C. 4.0 J
Explanation:
Work is equal to the change in kinetic energy or kinetic energy final - kinetic energy initial. 1/2 mv^2 is the equation for kinetic energy. SInce the mass is the same, you don't have to include it when solving. 1/2 times 1^2 = 1/2. 1/2 times 3^2 = 4.5. 4.5 - 0.5 = 4 J
Answer:<em> tried my best to answer your ?s:</em>
<em>B</em>
<em>A</em>
<em>B</em>
<em>D</em>
<em>A</em>
<em>A</em>
<em>B?</em>
<em>Hope this helps!!</em>
I think the answer should be D.<span>It reduces the amount of thermal energy that is transferred from outside to inside the container. </span>
<span>Recall formula for Kinetic energy is:
KE = 1/2mv^2, where KE = 275J
and momentum (which is 25.0 kg m/s) = m*v
Therefore substitute for KE and mv in the equation above to get speed
=> 275 = 0.5 * 25 * v
v = 275/12.5
v = 22m/s
to get mass m, recall momentum = m*v
=> 25= 22*m
m= 25/22 = 1.3663kg</span>
