A body which is uniformly retarded comes to rest in 10s after travelling a distance of 20 m. Calculate its velocity
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Explanation:
Initial Velocity (u) = ?
Time (t) = 5 seconds
Distance (s) = 10 m
Final velocity (v) = 0 m/s^2 [As it is coming to a rest]
U = v + at = 0 + 5a
=> 5a = a = u/5 ——— [To be substituted in the following equation]
S = ut - (1/2) at^2 = 5u - (1/2) (u/5) (25)
=> 10 = 5u - 5u/2
=> 10 = 5u/2 => 20 = 5u
=> u = 20/5
= 4 m/s
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