A body of mass 10 kg is sliding on a frictionless surface with a velocity of 2,m{{s}^{-1}} . The force required to keep it moving with a same velocity is ...
An atom X is represented as follows {}_{21}^{45} ext{X} . The numbers of protons, electrons and neutrons in this atom are: a) 21, 21, 24 b) 21,21,23 c) 20,20,24 d) 20,20,23 ...
