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Q.

A rocket of initial mass 6000 kg ejects mass at constant rate of 200 kg/sec. with constant relative speed of 800 m/sec.  The acceleration of the rocket after 5 sec is (neglect gravity)

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a

60 ms–2

b

32 ms–2

c

50 ms–2

d

16 ms–2

answer is D.

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Detailed Solution

After 5 sec mass of the rocket 

6000−5×200=5000kg

a=udmdtm=200×8005000=32ms−2

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