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Ha , I've done my test. It's about graph, complex numbers and integration. And my teacher told me I got 98%~! so happy:p

20) A particle moves in a straight line . At time t seconds its displacement is x metres from a fixed point O on the line, its acceleration is a ms^-2, and its velocity is v ms^-1 where v is given by v=32/x - x/2. a) find an expression for a in terms of x. b) Show that t = integrate(2x /...

20) A particle moves in a straight line . At time t seconds its displacement is x metres from a fixed point O on the line, its acceleration is a ms^-2, and its velocity is v ms^-1 where v is given by v=32/x - x/2. a) find an expression for a in terms of x. b) Show that t = integrate(2x /...

thx for telling me the truth

you guys have clearly explained what is freefalling, but not weightlessness Alcalder have explained that, but not simple enough In fact, when the astronaut was in a capsule travelling around the Earth in a circular orbit with speed V, there must be a force preventing it from escaping from the...