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A ball thrown vertically upward returns ...

A ball thrown vertically upward returns to its starting point in 4 s. Find its initial speed.

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To solve the problem of finding the initial speed of a ball thrown vertically upward that returns to its starting point in 4 seconds, we can follow these steps: ### Step 1: Understand the motion of the ball The ball is thrown upward and returns to the same position after a total time of 4 seconds. This means that the time taken to reach the highest point is half of the total time, which is 2 seconds. ### Step 2: Use the equations of motion We can use the first equation of motion, which relates initial velocity (u), final velocity (v), acceleration (a), and time (t): \[ v = u + at \] ...
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