A car accelerates uniformly from rest to a speed of 20 m/s in 5 seconds. What is the magnitude of its acceleration?
4 m/s2
For uniform acceleration, \(a = \dfrac{v - u}{t}\).
The car starts from rest, so \(u = 0\); final speed \(v = 20\) m/s and time \(t = 5\) s.
\(a = \dfrac{20 - 0}{5} = 4\) m/s2.
So 2 m/s2 would need 10 s, while 10 m/s2 and 25 m/s2 come from wrong operations on the given values.
Hence, 4 m/s2.
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