A 2.0-kg mass is projected from the edge of the top of a 20-m tall building...
A 2.0-kg mass is projected from the edge of the top of a 20-m tall building with a velocity of 24 m/s at some unknown angle above the horizontal. Disregard air resistance and assume the ground is level. What is the speed of the mass just before it strikes the ground?
a 42 m/s
b 31m/s
c 51 m/s
d 27 m/s
e none of the above
Homework Answers
v^2 -u^2 = 2as
v2 = u2 +2as = (24)2 + (2*9.8*20) =968
v = (968)1/2 = 31 m/s
Option (b) is correct
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