  A ball is thrown vertically downward from the edge of a bridge 22.0 m high with an initial speed of 11.0 m/s. The ball falls all the way down and strikes the water below. Determine the time it takes the ball to strike the water.

Question

A ball is thrown vertically downward from the edge of a bridge 22.0 m high with an initial speed of 11.0 m/s. The ball falls all the way down and strikes the water below. Determine the time it takes the ball to strike the water.

Step 1

Finding the time taken by the ball to strike the water.

Given information:

The ball is thrown downwards from edge of the bridge which is at 22 m height.

Initial velocity of the ball is 11m/s.

Step 2

Formula used:

To find the time taken by the mail bag to reach the ground we use second equation of motion.

Now for vertical motion we can write the equation as,

Since acceleration and velocity are in the same directions, the object speeds up as it falls downward.

Step 3

Calculation:

Finding the time taken by the ball to strike the water.

Choose the origin at the edge of the building with the positive direction upward and the negative direction downward. To find the time when the position is &...

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Physics 