Question

a body travling with unform acceleration crosses two point A and B with velocity 20m/s and 30m/s respectfully the speed of the body at midpoint A and B is

Answer 1

v2 - u2 = 2as = 900 - 400 = 500
Thus, as = 250 --- (1)

At s/2 if speed is w: w2 - u2 = 2a(s/2)
Which means, w2 = u2 + as = 400 + 250, using (1).
Or, w = √650) = approx 25.5 m/s.