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