Question

3. An object of mass 8 kg is sliding down a friction lessinclined plane of length 11 m that makes an angleof 70 deg with the horizontal. Calculate thework done by gravitational force as the objectslides from the top of the inclined plane to theground. (1 point)A. 099.045 JB. O1135.872 JC.810.391 JD.499.917

Answer 1

Given

Mass of the object, m=8 kg

Length of the inclined plane, l=11 m

Angle of inclination,

`\theta=70^o`

To find

Calculate the work done by gravitational force as the object slides from the top of the inclined plane to the

ground.

Step-by-step explanation

The height of the ramp

`h=lsin\theta=11sin70^o`

The work done by gravitational force,

`\begin{gathered} W=mgh \\ \Rightarrow W=8*9.8*11sin70^o \\ \Rightarrow W=810.390J \end{gathered}`

Conclusion

The work done is C.810.391