Question

1.A space craft flying in a straight course with a
velocity of 75 km s-1 fires its rocket motors
for 60 s. At the end of this time, its speed is
120 km s-l 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 6s

2.A train starts from rest and accelerates uniformly
at a rate of 2 m s-2 for 10 s. It then maintains a
constant speed for 200 s. The brakes are then
applied and the train is uniformly retarded and
comes to rest in 50 s. Find : (i) the maximum
velocity reached, (ii) the retardation in the last
50 s, (iii) the total distance travelled, and
(iv) the average velocity of the train.
Ans. (i) 20 m s-1, (ii) 0-4 m s-2
(iii) 4600 m, (iv) 17.69 ms​

Answer 1

Answer:

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