I'm sorry I don't Know but I would add the numbers together hope that helps
The rock's height <em>y</em> at time <em>t</em> is given by
<em>y</em> = 45 m + (7.2 m/s) <em>t</em> - 1/2 <em>g</em> <em>t </em>²
where <em>g</em> = 9.80 m/s² is the magnitude of the acceleration due to gravity. Set <em>y</em> = 0 and solve for <em>t</em> :
0 = 45 m + (7.2 m/s) <em>t</em> - 1/2 <em>g</em> <em>t </em>² → <em>t</em> ≈ 3.9 s
Answer:
kinetic energy of 16 J. Determine the velocity of the first toy, and the mass of the ... distance of 12 cm into the tree. ... b) the average force exerted on the bullet while slowing down to a stop.
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motion
vt=vo+at
10 m/s = 2 m/s + 2.2 m/s².t
8 = 2.2t
Sound waves are like waves in the ocean. when there is an earthquake under the water, the waves are created but, they do not move the water. This is because the water is acting as a medium for the energy produced by that earthquake. Because the energy stored in the sound wave needs particles to bounce off of the answer is D.