Lebron bikes 800m to the left in 25s. what was his average velocity in m/s?
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PHYSICS
A river 800m wide flows at the rate of 5kmh
−1
. A swimmer who can swim at 10kmh
−1
in still water, wishes to cross the river straight.
(i) Along what direction must he strike?
(ii) What should be his resultant velocity?
(iii) How much time he would take?
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ANSWER
Let the angle between the swimmer and the perpendicular to the flow of river is θ with the perpendicular to the flow of river and time to cross the river is t
(i)
The direction is given as,
sinθ=
10
5
θ=30
∘
(ii)
The resultant velocity is given as,
V=V
sg
cos30
∘
=10cos30
∘
=8.66km/h
(iii)
Displacement in vertical direction is given as,
(V
sg
cosθ)t=800×10
−3
(10cos30
∘
)t=800×10
−3
t=0.092s
t=5.5min
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