If a car travels 23.8 meters in 4.2 seconds, what is its speed? Put your units in the form of a correct abbreviation (example, write s

Question

If a car travels 23.8 meters in 4.2 seconds, what is its speed?
Put your units in the form of a correct abbreviation (example, write s for seconds, m
for meters, or m/s for meters per second).

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Adela 5 years 2021-08-01T05:10:45+00:00 1 Answers 22 views 0

Answers ( )

  1. Sapo1
    0
    2021-08-01T05:12:03+00:00
    Reply

    Displacement = Initial Velocity * time + 0.5 * acceleration * time^2

    Initial velocity * time = 0 since we assume that the car is launching from start without motion.

    So, displacement = 0.5 * acceleration * time ^ 2

    23.8 = 0.5 * acceleration * 4.2^2

    23.8 = 0.5 * 17.64 * acceleration

    23.8 = 8.82 * acceleration

    23.8/8.82 = acceleration = 2.69 m/s^2

    Final Velocity = initial velocity + acceleration * time

    Final velocity = 0 + 2.69 * 4.2 = 11.3 m/s

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