Estimate the acceleration you subject yourself to if you walk into a brick wall at normal walking speed. (make a reasonable estimate of your speed and of the time it takes you to come to a stop.) give your reasoning, and make sure your estimate has units

From certain assumptions that the walking speed is 2 m/s, and the stop time is 0.1 s the acceleration would be -20 m/s

Explanation:

Using the average acceleration formula:

where and are the changes in the speed and time respectively.

We have by assuming that the walking speed is 2 m/s and the stop time is 0.1s which is equal to the change in time during the stopping.

, where are the initial speed and final speed respectively, and

Plugging the previous in the average acceleration formula we get

where the minus sign indicates an acceleration in the opposite direction of the motion (or in other word opposite to the speed's direction).

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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