When will you say a body is in (i) uniform acceleration? (ii) non-uniform
acceleration?

A)WHEN THE SPEED /VELOCITY OF THE OBJECT IS EQUAL IN SAME INTERVAL OF TIME .EXAMPLE -15 M/S^2IN 10 S

AND AGAIN 15M/S^2 IN NEXT 10 S

B)WHEN THE SPEED OF AN OBJECT CHANGES IN SAME INTERVAL OF TIME.

LIKE 10M/S^2 IN 10S AND 20M/S^2 IN NEXT 10 S

the answer is false

explanation:

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.