science
Grade-9
Easy
Question
An object falling from the top of a building reaches a velocity of ___ m/s in 20 s.
Hint:
196 m/s
The correct answer is: 196
GIVEN:
Time = 20 s
Initial velocity = 0
Acceleration = 9.8 m/s2
Solution:
Acceleration, a = (v – u) /t
9.8 = (v – 0)/20
9.8 = v/20
v = 9.8 x 20 = 196 m/s
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