Uniform acceleration
Reason — When a body is falling freely, the acceleration is said to be uniform as equal changes in velocity takes place in equal intervals of time.
Question
Free fall of a body near earth’s surface is an example of: (a) Uniform acceleration (b) Uniform velocity (c) Variable acceleration (d) None of these
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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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