A student walks 30 feet to the right. Then walks 10 feet to the left. Then walks 20 feet to the right. It took 20 seconds to do all of this. What was the students velocity? (use ft/s and direction as unit)

The students velocity is 3 ft/s

Explanation:

Velocity (ft/s)

Velocity is the Total distance covered over time taken to cover the distance. D/t

Overall movement to the right is the distance covered.

Total distance covered = 30 ft - 10 ft + 20 ft

                                       = 40 ft

Time taken = 20 s

Students velocity = 40 ft / 20 s

Students velocity = 2 ft/s

The student's displacement (straight-line distance between initial and final positions) is 40-ft right.

Velocity = displacement / time

Velocity = 40-ft right / 20 sec

Velocity = 2 ft/sec right .

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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going in opposite directions