Aparticle of mass m is acted upon by a net force f. as a result of the force, the particle moves along a line with its position measured as p se the speed is observed to change at a constant rate from a value of s1 at s1 to a value of s2 at s2 from a reference point labelled o. as the particle moves from s1 to s2, (a) express the acceleration of the particle as it moves from s1 to s2 in terms of 81, $2, 81, and s2. (b) if the numerical values of s1, 82, 81, and s2 are 0 m, 500 m, 100 m/s, and 50 m/s respectively, what is the acceleration as the particle moves from s1 to s2?