a helicopter flies southeast with a ground speed of 250 km/h. if the wind
speed is 17 km/h southeast, what is the air speed?
a. 249 km/h
b. 251 km/h
c. 233 km/h
d. 267 km/h

C. 233 km/h

Explanation:

Ground speed = air speed + wind speed

250 km/h = v + 17 km/h

v = 233 km/h

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