A woman of mass 45kg is standing in an elevator. a) If the elevator floor pushes

Question

A woman of mass 45kg is standing in an elevator. a) If the elevator floor pushes up on her feet with a force of406N, what is the acceleration of the elevator?(magnitude anddirection) b) If the elevator is moving at 1.1m/s as it passes thefourth floor on its way down, what is its speed 2.5s later? A woman of mass 45kg is standing in an elevator. a) If the elevator floor pushes up on her feet with a force of406N, what is the acceleration of the elevator?(magnitude anddirection) b) If the elevator is moving at 1.1m/s as it passes thefourth floor on its way down, what is its speed 2.5s later?

Explanation / Answer

lift pushes upwards
so taking the equation in upwards direction
406 - mg = ma 406 - 45g = 45 a a = -0.78 m/s^2 means she is acceleratingdownwards
v = u + at v = -1.1 - .78 * 0.25    = 3 m/s

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