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A spaceship is moving in space with a velocity of 50km/s its engine fires for 10,such that its velocity increases to n60km/s calculate the total distance

travelled by the spaceship in 1/2 min from the time of firing its engine



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Distance travelled in the first 10 seconds, =  avg velocity * time
     s1 = (50+60)/2 km/s * 10 sec  = 550 km

distance travelled inthe next 20 sec =  60 km/s * 20 s = 1, 200 km

so total distance in 30 sec. = 1, 750 km

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