Zach is making a round trip going from home to work. to get to her work she goes 30 m/s and then to get back home she goes 50 m/s. what is the velocityof zach for the entire round trip? a.0 m/s b.-20 m/s c.80 m/s

Vamos supor que o trajeto tem 300 metros:

Na ida ele faz o trajeto em:

t=300/50=30/5=6 s

Na volta:

t=300/30 = 10s

Somamos o tempo total:

t=10+6=16s

E a distancia total:

300.2 = 600

e fazemos:

v=600/16= 37,5 m/s

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