If a car travels 23.8 meters in 4.2 seconds, what is its speed?
1 answer:
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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