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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics | 3rd Edition | ISBN: 9780321740908 | Authors: Randall D. Knight
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A rock is thrown (not dropped) straight down from a bridge

Chapter 2, Problem 13CQ

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QUESTION:

Problem 13CQ

A rock is thrown (not dropped) straight down from a bridge into the river below.

a. Immediately after being released, is the magnitude of the rock’s acceleration greater than g , less than g , or equal to g ? Explain.

b. Immediately before hitting the water, is the magnitude of the the rock’s acceleration greater than g , less than g , or equal to g ? Explain.

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QUESTION:

Problem 13CQ

A rock is thrown (not dropped) straight down from a bridge into the river below.

a. Immediately after being released, is the magnitude of the rock’s acceleration greater than g , less than g , or equal to g ? Explain.

b. Immediately before hitting the water, is the magnitude of the the rock’s acceleration greater than g , less than g , or equal to g ? Explain.

ANSWER:

Step 1 of 2

a)

The rock was thrown downwards.

After getting released from your hand, you can’t exert any force on it any more.

So, the only force acting on it is the force of gravity.

So, the acceleration will be the same as g.

But the initial speed will be there which will result in an increased velocity. But still the acceleration will be g.

 

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