Answer:
40 J
Explanation:
Using equation of linear motion
v² = u² + 2as
where v is final velocity attain, u is initial velocity which is = 0 m/s since it is starting from rest, a is acceleration in m/s² and s is the distance covered
(20 m/s)² = 0 + 2 a × 1.2 m
400 / 2.4 = a
a = 166.67 m/s²
F = ma = 0.2 × 166.67 = 33.33 N
work done by the troubled youth = force × distance = 33.33 × 1.2 m = 40 J
