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Physics with MasteringPhysics | 4th Edition | ISBN: 9780321541635 | Authors: James S. Walker
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BIO Gulls are often observed dropping clams and other

Chapter 2, Problem 74P

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QUESTION:

Problem 74P

BIO Gulls are often observed dropping clams and other shellfish from a height to the rocks below, as a means of opening the shells. If a seagull drops a shell from rest at a height of 14 m, how fast is the shell moving when it hits the rocks? 75. A volcano launches a lava bomb straight upward with an initial speed of 28 m/s. Taking upward to be the positive direction, find the speed and direction of motion of the lava bomb (a) 2.0 seconds and (b) 3.0 seconds after it is launched.

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QUESTION:

Problem 74P

BIO Gulls are often observed dropping clams and other shellfish from a height to the rocks below, as a means of opening the shells. If a seagull drops a shell from rest at a height of 14 m, how fast is the shell moving when it hits the rocks? 75. A volcano launches a lava bomb straight upward with an initial speed of 28 m/s. Taking upward to be the positive direction, find the speed and direction of motion of the lava bomb (a) 2.0 seconds and (b) 3.0 seconds after it is launched.

ANSWER:

Solution 74P

Step 1 of 3

Here we have to calculate the final velocity of the shell when it hits the rocks. The shell is dropped from the height .

In the given case, the shell is dropped from certain height, so the initial velocity of the shell will be zero (). Also, the shell is freely falling under gravity, so the acceleration of the shell will be equal to the acceleration due to gravity and is given by .

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