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Answer:
106.25 m
Explanation:
Acceleration a = force / mass
= 40 / 80 = 0.5 m /s²
initial velocity u = 20 m /s
a = 0.5 m /s²
time t = 5 s
displacement s = ?
s = ut + 1/2 a t²
= 20 x 5 + .5 x .5 x 5²
= 100 + 6.25
= 106.25 m .