1.

A rocket is fired vertically from the ground. It moves upwards with a constant acceleration 10 ms2 for30 seconds, after which the fuel is consumed. After what time from the instant of firing, the rocket will attairnthe maximum height ? (Take g = 10 ms-2 )g102)?A)75 s (taFZ)(B) 60 s䝘ぎre)(C) 45 s (torg)(D) 30 s (m)

Answer»

S=ut+1/2(at²)

s=4500m

Putting in v²-u²=2as

We get v=300m/s

Now a=-10m/s² after the fuel is consumed

So v=u-gt

We get t=30s

Total time for which rocket is ascending=30s+30s=60s

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