IDNStudy.com, kung saan ang iyong mga tanong ay may mabilis na sagot. Sumali sa aming platform upang makatanggap ng mabilis at eksaktong tugon mula sa mga propesyonal sa iba't ibang larangan.

1.              
A boy throws a ball vertically downward at 10 m/s from the roof
of a building 20 m high.  (a) How long will it take the ball to reach
the ground?  (b) What will be its speed
when it strikes the ground?


Sagot :

formula is
y= -1/2gt^2
so
square root of
t= 1(-20m)/-9.8m/s6^2
t=1.43s