An object is moving in a straight-line path has a velocity of $40 m/s$ at some instant. After $5 s$ , its velocity changed to $30 m/s$ . What is the average acceleration of the ball during this time interval?

2 {m/s}^{2}

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- 2 {m/s}^{2}

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- 4 {m/s}^{2}

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4 {m/s}^{2}

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Solution

The correct option is B $- 2 {m/s}^{2}$
Average acceleration of the object is given by
$¯ a = \frac{v_{f} - v_{i}}{t}$ where, $v_{f}$ is the final velocity of the object, $v_{i}$ is the initial velocity of the object and $t$ is the time taken by object to attain the final velocity from initial.
Hence, average acceleration is given by
$¯ a = \frac{30 - 40}{5} = - 2 {m/s}^{2}$

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An object is moving in a straight-line path has a velocity of 40 m/s at some instant. After 5 s, its velocity changed to 30 m/s. What is the average acceleration of the ball during this time interval?

An object is moving in a straight-line path has a velocity of $40 m/s$ at some instant. After $5 s$ , its velocity changed to $30 m/s$ . What is the average acceleration of the ball during this time interval?