A massive missile has a mass of 1.95 × 106 kg at takeoff, and its engines produce a thrust of 3.9 × 107 N .  (a)  Find its initial acceleration, in meters per second squared, if it takes off vertically. Take up to be positive.   (b) How long, in seconds, does it take to reach a velocity of 120 km/h straight up, assuming constant mass and thrust?

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: