At time tt = 0 a 2270 kgkg rocket in outer space fires an engine that exerts an increasing force on it in the +x+x-direction. This force obeys the equation Fx=At2Fx=At2, where tt is time, and has a magnitude of 781.25 NN when ttt = 1.49 ss.(a) Find the SI value of the constant A, including its units.
(b) What impulse does the engine exert on the rocket during the 1.50-s interval starting 2.00 s after the engine is fired?
(c) By how much does the rocket?s velocity change during this interval? Assume constant mass.

Acar moves at 12m/s and coasts up a hill with a uniform acceleration of -1.6m/s2. how far has it traveled after 6.0s?

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".