Explain why
(a) A horse cannot pull a cart and run in empty space.
(b) Passengers are thrown forward from their seats when a speeding bus stops suddenly.
(c ) A cricketer moves his hands backwards when holding a catch.

Explanation

(a) The horse cart will not have any reaction (as in case of ground) on it in empty space.
(b) Because of inertia.
(c ) As `F=Delta P//Delta t`, so if the player moves his hands backward, `Delta t` will increases and hencd F will decrease.