Question

The velocity of a truck changes from 90km/hour to 18km/hour in 5 seconds. Calculate the force acting on truck if mass of truck is 4500 kg

Answer 1

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Answer 2

Initial velocity, u= 90 km/hr = 25 m/s
Final velocity , v = 18 km/hr = 5 m/s

Acceleration ,a = (v - u)/t
a = (25 - 5)/5
a = 20/5 = 4 m/
${s}^{2}$
Now, force = ma
m = 4500 kg
F = 4500 x 4 = 18000 N = 18 kN

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