Question

2m/s to 6m/s in 2seconds

Answer 1

Answer on Question #61727-Physics-Mechanics | Relativity

A particle has:

$\bigcirc$ an average acceleration of $6 \, \text{m/s}^2$ if it goes from $2 \, \text{m/s}$ to $6 \, \text{m/s}$ in 2 seconds.

$\bigcirc$ an average acceleration of $4 \, \text{m/s}^2$ if it goes from $2 \, \text{m/s}$ to $6 \, \text{m/s}$ in 2 seconds.

$\bigcirc$ an average acceleration of $12 \, \text{m/s}^2$ if it goes from $2 \, \text{m/s}$ to $6 \, \text{m/s}$ in 2 seconds.

$\bigcirc$ an average acceleration of $3 \, \text{m/s}^2$ if it goes from $2 \, \text{m/s}$ to $6 \, \text{m/s}$ in 2 seconds.

$\bigcirc$ an average acceleration of $2 \, \text{m/s}^2$ if it goes from $2 \, \text{m/s}$ to $6 \, \text{m/s}$ in 2 seconds.

Solution

The average acceleration is

$$a = \frac {v _ {f} - v _ {i}}{t} = \frac {6 - 2}{2} = 2 \frac {m}{s ^ {2}}.$$

So, the last choice is true.

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