Question

A girl starts her bicycle from rest and accelerates uniformly to 7m/s in a distance of 14m. Calculate the acceleration of the girl and time taken by her to travel the distance.

Answer 1

Answer:

u = 0

v= 7m/s

s=14m

From the relation,

v²=u²+2as

47=0+2×a×14

a= 2×14/27

a=1.03703704

time taken ,

v=u+at

7=0+1.03703704×t

t=6.74999764s

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Answer 2

Answer:soln                                                                                  so that u know                                                                                                                                                      

given,                                                                                       sq=square

final velocity = 7m/s

initial velocity = 0m/s ,distance(s)= 14m

a=?

t=?

now

we know that ,

vsq=usq+2as

49=0+2as

49=2a(14)

49/14=2a

2a=3.5

a=1.75

again

t=v-u/a

t=7-0/1.75

t=4s