Question

Five marbles roll down a ramp. Each marble reaches the bottom of the ramp at a speed of 3 meters/second. Which marble has the highest kinetic energy at the bottom of the ramp? The table lists the mass of each marble.

Marble 1 10g
Marble 2 20g
Marble 3 25g
Marble 4 40g
Marble 5 30g

Answer 1

marble 4.

do not question the answer to the question then you have another question to ask.

Answer 2

As kinetic Energy is calculated E=1/2×m×v^2. and there is now difference in their Speed, the only important value is m. As you can see from the Formula, the bigger m becomes, the more Energy is there. So you only have to choose the marble with the biggest m.