The Box's Acceleration : g sin θ
<h3>Further explanation </h3>
Newton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object
∑F = m. a
F = force, N
m = mass = kg
a = acceleration due to gravity, m / s²
We plot the forces acting on the block (picture attached) according to the y-axis and the x-axis.
Because the motion of the block is in the same direction as the x-axis, ignoring the friction force with the inclined plane, then

on touching electroscope gets positively charged, so answer is B. conduction
Explanation:
the inability to change the position from rest to motion or motion to rest by themselves is inertia.
You just multiply these two numbers. It's 5200J, or 5.2kJ