Alarge rocket has a mass of 2.00×106kg at takeoff, and its engines produce a thrust of 3.50×107n. (a) find its initial acceleration if it takes off vertically. (b) how long does it take to reach a velocity of 120 km/h straight up, assuming constant mass and thrust?

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Which best represents the law of conservation of mass ?

Ineed the answer to question 1 , i’m desperate