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A ball rolls off the edge of a horizontal tabletop, 4.23 ft high. It strikes the floor at a point 5.11 ft horizontally away from the edge of the table. (a) For how long was the ball in the air? (b) What was its speed at the instant it left the table?

A ball rolls off the edge of a horizontal tabletop, 4.23 ft high. It strikes the floor at a point 5.11 ft horizontally away from the edge of the table. (a) For how long was the ball in the air? (b) What was its speed at the instant it left the table?

Grade:10

1 Answers

Jitender Pal
askIITians Faculty 365 Points
8 years ago
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The negative sign for y is due to the fact that the ball is displacing in the downward direction and the nature of convention adopted.
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Therefore, the time taken by the ball to fall from height 4.23 ft is 0.51 s .
235-1173_1.PNG
Therefore, the vertical component of initial speed of the ball when it just fell from the table is 10 ft/s .

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