Aya98idn
Answered

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A ball is dropped from rest by a little boy from the window of a three-story apartment.
a) How far has it fallen after 1 second?
b) What is the ball's velocity after 1 second of fall?
c) How far does the ball fall during 2nd second?


Sagot :

Yhiidn
Since it is a projectile motion we will use d=1/2g[tex] t^{2} [/tex] for no.1 
Vf=gt for no.2 and d=Vi t + 1/2g[tex] t^{2} [/tex]

a) d = 1/2g[tex] t^{2} [/tex]
1/2(-9.8m/[tex] s^{2} [/tex] (1s)[tex] ^{2} [/tex] (cancel together the [tex] s^{2} [/tex] )
= -4.9m
b) Vf = gt
(-9.8m/[tex] s^{2} [/tex]) (1s)
= -9.8m/s
c) d=Vi t + 1/2 g[tex] t^{2} [/tex]
-9.8 m (1s) + 1/2 (-9.8m/[tex] s^{2} [/tex]) (1s)[tex] ^{2} [/tex]
= - 9.8m + (-4.9m)
-14.7 m

Hope it helps :-)