An object starts from rest and moves with a velocity of (3i+4j)ms^(−1) . It covers a distance of 400km.Find a) its acceleration b) the time taken to cover the distance 400km.


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Question Number 47801 by Rio Michael last updated on 14/Nov/18

$A n o b j e c t s t a r t s f r o m r e s t a n d m o v e s w i t h a v e l o c i t y o f$ $(3 i + 4 j) {m s}^{- 1} . I t c o v e r s a d i s t a n c e o f 400 k m . F i n d$ $a) i t s a c c e l e r a t i o n$ $b) t h e t i m e t a k e n t o c o v e r t h e d i s t a n c e 400 k m .$
	Answered by mr W last updated on 15/Nov/18

	$v e l o c i t y = \sqrt{3^{2} + 4^{2}} = 5 m / s = c o n s t a n t$ $a) a c c e r l e r a t i o n i s z e r o$ $b) t i m e = 400 / 5 = 80 s e c o n d s$ $i f y o u r e a l l y m e a n 400 k m, t h e n$ $t i m e = 400000 / 5 = 80000 s = 22.2 h \approx 1 d a y$
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