a truck starts from rest and moves down a hill with constant acceleration . it travels a distamce of 400 m in 20 secs .. find its acceleration and force if mass of truck is 7 metric tonnes
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d = 400m
t= 20 sec
s = ut +1/2at²
a = 2s/t²
a = 2×400/20²
a = 2 m/s
f = ma
f = 7000 × 2
= 14,000 kgm/s²
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