4. Fill in the space.
(a) Force is measured in the unit of
(b) A body moves in a circular path due to
(c) A
exerts force on iron, cobalt and nickel.
(d) Every object on the earth has
(e) We are able to write because of
(f) The change in displacement in unit time is
(g) The S.I. unit of velocity is
for
and of acceleration is
