1. How large a force is required to
accelerate a 300 kg car from rest to a
speed of 20 m/s in a distance of 80 m?
1) 3.25 kN 2) 67.4 kN
3) 32.5 kN 4) 6.74 Kn
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mass m = 300 kg
initial velocity u = 0 m /s
final velocity v = 20 m / s
distance s = 80 m
force f = ?
as we know
v = u + at
putting values , we can find acc. a
20 = 0 + a*80
20 = 80 a
a = 20 / 80
a = 1 / 4
a = 0.25 ms^2
now
F = m*a
F = 300 * 0.25
F = 75 N
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