20) This problem is fairly simple. We can use the conservation of energy to solve this problem. In this problem, there is kinetic energy and gravitational potential energy. Let’s assume the initial height as some variable h and the mass as m.
Now, we can simplify the equation as much as possible and solve for v[B].
You might be wondering if the + or - matters. The + or - indicates that the speed is the same, but the velocity is not necessarily the same. This means the magnitude will be the same, but the direction of the motion may be different. In this case, the sign doesn't matter because the problem asks for the speed.
Answer: B
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