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tiny-mole [99]
3 years ago
15

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

Physics
1 answer:
Lena [83]3 years ago
5 0
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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