Weight = mass * gravity
420 = mass * 9.8
mass of Betty = 42.857 kg
Difference in height = 1 - 0.45 = 0.55 meters
Total energy = Kinetic energy + potential energy
At the highest point, the kinetic energy is zero while the potential energy is maximum, therefore, we can get the total energy as follows:
Total energy = 0 + mgh
Total energy = 42.857*9.8*0.55 = 231 Joules
At the lowest point, the potential energy is zero while the kinetic energy is maximum. Therefore:
Total energy = 0.5 * m * (v)^2 + 0
231 = 0.5 * (42.857) * (velocity)^2
(velocity)^2 = 10.78
velocity = 3.28 meters/sec
1. C
<span>2. G </span>
<span>3. H </span>
<span>4. J </span>
<span>5. B </span>
<span>6. I </span>
<span>7. D </span>
<span>8. E </span>
<span>9. A </span>
10. F and <span>For the best answers, search on this site </span>https://shorturl.im/FbQuG<span> </span><span>
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