A spaceship ferrying walks to Moon base. It takes a straight line path from the earth to the moon, a distance of 384,000 km. Suppose it accelerates at 20 m/s2 for the first 15 min of the trip. Then travels with same speed until the last 15 min, when it decelerates at 20 m/s2 just coming to rest as it reaches the moon.
(i) What distance does it travel while decelerating?
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Ans.
(i)
Sol. 5.1 × 103 km
(ii)
Sol. 0.95
(iii)
Sol. 370 min
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