second law of motion

(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.

Fill in the following blanks with suitable words: (a) To every action, there is an…..and….reaction (b) Momentum is a…….quantity. Its unit is…… (c ) Newton's second law of motion can be written as Force=mass xx …….or Force=………….of change of.......... (d) Forces in a Newton's third law pair have equal......but act in opposite..... (e) In collisions and explosions, the total.......remains constant, provided that no external........acts.

State secound law of motion and show that second law is the real law of motion .

According to Kepler's second law of planetary motion,

What is meant by the Law of Conservation of Momentum ? Deduce this law mathematically with the help of Newton's second and third law of motion.