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प्रश्न
A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 s. Find its acceleration. Find the force acting on it if its mass is 7 metric tonnes (Hint: 1 metric tonne = 1000 kg).
उत्तर
Distance covered by the truck (s) = 400 m
Time (t) = 20 s
Initial velocity (u) = 0
Mass of the truck: m = 7 tons = 7000 kg (1 metric ton = 1000 kg)
According to the second equation of motion
S = ut + 12at2
400 = 0 × 20 + 12 × a × (20)2
a = 2m/s2
Hence, acceleration of the truck = 2m/s2
Since force (F) = mass × acceleration (a),
F = 7000 × 2
F = 14000N
Hence, force applied on the truck = 14000 N
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