Question 36:
(a) State and explain Newton’s second law of motion.
(b) A 1000 kg vehicle moving with a speed of 20 m/s is brought to rest in a distance of 50 metres :
(i) Find the acceleration.
(ii) Calculate the unbalanced force acting on the vehicle.
Lakhmir Singh Physics Class 9
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Answer:
newton's second law of motion :-
The second law of motion states that the rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of force.
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According to Newton's second law of motion the force is equal to the rate of momentum. ... Then the force is the product of mass and acceleration. Hence the unit of force is Newton or kgm2.
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