Question #921bb

1 Answer
HCH
Jul 15, 2017

19.6133 m

Explanation:

This is a free fall motion

Information given:
#v_0=o#
#a=-9.80665ms^-2#
#t=2s#

Use the formula:
#x=v_0t+1/2at^2#

#x=0(2)+1/2(-9.80665)(2)^2#
#x=-19.6133m#

why negative??
What we calculated is displacement, a vector quantity.
In this case, negative sign signifies the stone is travelling down in respect to the origin point.

To get distance , a scalar quantity, in this case just take the magnitude of displacement as it is a straight line motion.

Distance travelled in the first 2s is 19.6133 m

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