To find the mean velocity of the ball while descending the ramp, we can use the formula for mean velocity:
\[ \text{Mean Velocity} = \frac{\text{Total Distance}}{\text{Total Time}} \]
In this case, the total distance is the length of the ramp, which is 77.4 cm, and the total time is 1.8 seconds.
Substituting the values:
\[ \text{Mean Velocity} = \frac{77.4 , \text{cm}}{1.8 , \text{s}} \approx 43 , \text{cm/s} \]
Thus, the ball's mean velocity while descending the ramp is:
\[ \text{Mean Velocity} \approx 43 , \text{cm/s} \]
The correct answer is: B. 43 cm/s
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