A car accelerates uniformly from rest to a speed of 20 m/s in 5 seconds. What is the total displacement during this time?
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Correct answer
B. 50 m
Principle or equation
For uniformly accelerated motion with initial velocity u, final velocity v, and time t, displacement s = (u + v)t / 2. Here u = 0, v = 20 m/s, t = 5 s.
Why this answer is correct
Substitute the given values: s = (0 + 20) * 5 / 2 = 50 m. Therefore, the car travels 50 meters.
Example
If a ball is dropped from rest and reaches 10 m/s in 1 s, its displacement in that second is (0+10)*1/2 = 5 m.
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