Desde una azotea de un rascacielos de 120 m. de altura se lanza una piedra con velocidad de 5 m/s , hacia abajo. Calcular a) Tiempo que tarda en llegar al suelo, b) velocidad con que choca contra el suelo

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

the answer is 100. i just did this lesson and got a 100% on it. : )

-fishtank