Respuesta :
Answer:
The work done by the friction is 55.8 J.
Explanation:
Given that,
Height h = 7 m
Mass of the object = 3 kg
Angle = 30°
Speed = 10 m/s
The initial potential energy of the object is converted in to the kinetic energy at the bottom of the incline and the work done by the friction
[tex]mgh=\dfrac{1}{2}mv^2+W[/tex]
Where, m = mass of the object
v = final velocity
g = acceleration due to gravity
h = height
Put the value in the equation
[tex]3\times9.8\times7=\dfrac{1}{2}\times3\times(10)^2+W[/tex]
[tex]W = (205.8-150)\ J[/tex]
[tex]W=55.8\ J[/tex]
Hence, The work done by the friction is 55.8 J.
