A motorist travels 50.0 km east then slows down to 36km/h and travels for 37 min. They travel a total time of 2 h and 34 min, what was their velocity for the first portion of the trip?

hey , the answer is c

b.a device that inputs heat into a cool object

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