Answer:
If the velocity and acceleration are in the same direction (both have the same sign - both positive or both negative) the object is speeding up. If the velocity and acceleration are in opposite directions (they have opposite signs), the object is slowing down.
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Answer:
θr will increase.
Explanation:
We know that when light travel from one medium to another medium the relationship between refractive index and angle given as
na. sinθa = nb . sinθr

If na is increased (by using a different type of glass) but θa is kept the same then sinθr will also increase.
So answer is θr will increase.
By Newton's 2nd law, m*a=sum_of_forces where m is the mass and a the acceleration. Here there are two forces in opposed directions.
Thus 5*a=40-8=32 therefore a=32/5=6.4m^s/2