A snowball rolls of a roof by accident. The roof is sloped 40.0
o
relative to the horizontal. The edge of
the roof is 14.0 m above the ground, and the speed of the snowball is 7.00 m/s as it rolls off the roof.
Ignore air resistance. Coincidentally, there is a group of management students standing 4.00 m from
the building.
(a) How far from the building does the snowball land?
(b) What is the speed of the snowball at impact?
(c) Did our snowball hit the management students, I mean were the management students ’accidently’
hit by the snowball?
2 answers
Im just wondering how can you find the speed of the snowball at impact?
initial vertical speed=-7*sin40
initial horizontal speed=7*cos40
time in air:
d=vi*t-1/2 g t^2
d=height, vi=-7sin40, solve for time t.
speed at impact:
vertical: vf=vi+gt
horizontal=7cos40
v=sqrt(vertical^2+horiz^2)
initial horizontal speed=7*cos40
time in air:
d=vi*t-1/2 g t^2
d=height, vi=-7sin40, solve for time t.
speed at impact:
vertical: vf=vi+gt
horizontal=7cos40
v=sqrt(vertical^2+horiz^2)
2 answers