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-

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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