Question

a body x mass of 0.2kg moving vertically upwards has its velocity increased uniformly from 10m/s to 40m/s in just 4 sec.
neglecting air resistance, calculate the upward cervical force acting on the body
let up force = f
then
f - mg = ma
f = m(a+g)
a = change in velocity / change in time = 30/4 = 7.5
f = .2(7.5+ 9.8)

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