Table of contents

2. 1D Motion / Kinematics

Intro to Acceleration

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Multiple Choice

Hank the hammerhead shark was swimming in the negative direction with a speed of $2.0 m / s$ . 1.0 second later he was swimming with a velocity of $- 4 m / s$ . What was his average acceleration during the 1.0 second interval?

- 6 m / s^{2}

- 4 m / s^{2}

0 m / s^{2}

2 m / s^{2}

6 m / s^{2}

- 2 m / s^{2}

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Identify the initial velocity $ v_i $ and the final velocity $ v_f $ of the shark. Here, $ v_i = -2 \text{ m/s} $ and $ v_f = -4 \text{ m/s} $.

Determine the time interval $ \Delta t $ over which the change in velocity occurs. In this problem, $ \Delta t = 1.0 \text{ s} $.

Use the formula for average acceleration $ a_{avg} $, which is given by $ a_{avg} = \frac{v_f - v_i}{\Delta t} $.

Substitute the known values into the formula: $ a_{avg} = \frac{-4 \text{ m/s} - (-2 \text{ m/s})}{1.0 \text{ s}} $.

Simplify the expression to find the average acceleration. This will give you the average acceleration of the shark during the 1.0 second interval.

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Hank the hammerhead shark was swimming in the negative direction with a speed of 2.0⁢m/s. 1.0 second later he was swimming with a velocity of −4⁢m/s. What was his average acceleration during the 1.0 second interval?