a What is retardation? (b) A ball is gently dropped from a height of 20m.
If its velocity increases uniformly at a rate of 10m/s', with what velocity will it
strike the ground? After what time will it strike the ground?
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Answer:
(A) Retardation is a negative acceleration .
(B) u = 0 , v = ? , A = 10 m/s , s = 20m
(V)² = (U)² + 2as
(V)² = (0)² + 2 x 10 x 20
(V)² = 0 + 400
(V) = ✓400
(V) = 20 m
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