Answer:
The coefficient of static friction is 0.524
Solution:
As per the question:
Angle made with the horizontal,

Acceleration of the truck, a = 2.69

Now,
Forces are balanced along the x- direction:
When the block sits at rest and is about to slide:
(1)
Also, static force of friction,
:

where
N = mgcos

Thus
(2)
Now, from eqn (1) and eqn (2):


Also,
a =




