Question

A 920-kg car with brakes applied travels at constant speed a distance of 8 m downhill along a road that makes an angle of 30o below the horizontal. The work W done by the force of gravity during this motion is:

Answer 1

W = 36064 J

Step-by-step explanation:

Work done by the force of gravity is given as

`W_g = F_g * d`

here we know that

`F_g = mg`

also we have

`d` = vertical displacement of the car in downward direction

now we have

`d = 8 sin30`

`d = 4 m`

now work done is given as

`W = (mg) d`

`W = (920 * 9.81)(4)`

`W = 36064 J`