m s-2
Reason — Retardation is decline in velocity (ms-1) of a body with time (s), so its unit is ms-2. Retardation is negative value of acceleration and has same unit as acceleration.
Question
The unit of retardation is — (a) m s-1 (b) m s-2 (c) m (d) m s2
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A space craft flying in a straight course with a velocity of 75 km s-1 fires its rocket motors for 6.0 s. At the end of this time, its speed is 120 km s-1 in the same direction. Find – (i) the space craft’s average acceleration while the motors were firing (ii) the distance travelled by the space craft in the first 10 s after the rocket motors were started, the motors having been in action for only 6.0 s.
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