Question

A box with a mass of 7 kilograms is pushed up a ramp to a height of 5 meters. what is the work done against the force of gravity? assume the ramp has negligible friction.

Answer 1

so work done = mgh = 7×10×5 = 350 joules

so answer is 350 joules !!

Answer 2

Answer: The work done by the ramp against the force of gravity is -343 J

Step-by-step explanation:

Work is defined as the force that is causing the movement or displacement of an object.

Mathematically,

`W=F* d`

We know that:

`F=m* g`

where,

W = work done by the ramp = ?

m = mass of the box = 7 kg

g = acceleration due to gravity =
`-9.8m/s^2` (Negative sign appears because it is acting against the gravity)

d = displacement = 5 m

Putting values in above equation, we get:

`W=7kg* (-9.8m/s^2)* 5m\\\\W=-343J`

Hence, the work done by the ramp against the force of gravity is -343 J