A crate is given a big push, and after it is released, it slides up an inclined plane which makes an angle 0.44 radians with the horizontal. The frictional coefficients between the crate and plane are (\muμs = 0.61, \muμk = 0.23 ). What is the magnitude of the acceleration (in meters/second2) of this crate as it slides up the incline?

The  acceleration is  

Explanation:

From the question we are told that

    The  angle which the inclined plane make with horizontal is  

     The frictional coefficients are   and  

The force acting on the  crate  is mathematically represented as  

Here f is the net force at which the crate is sliding down the plane which is mathematically represented as

        is the force due to weight which is mathematically represented as

       and   the force due to friction which is mathematically represented as

So  

substituting values

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.

no. dot product   =0 when vecs at right angles