Explain why (a) a horse cannot pull a cart and run in empty space, (b) passengers are thrown for...

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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
\( \mathrm{P} \) suddenly,
(c) it is easier to pull a lawn mower than to push it,
W
(d) a cricketer moves his hands backwards while holding a catch.
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