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oneicyahdaley10
08.02.2021 •
Physics
(d) The acceleration of a particle is a constant. At t = Os the velocity of the particle
is (10,20)m/s. At t = 4s the velocity is (0, 10)m/s.
(i) What is the particle's acceleration?
(ii) How do the position and velocity vary with time? Assume the particle is
initially at the origin.
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Ответ:
= √(400 + 225)
= √(625 m²/s²) = 25 m/s .
-- Its direction is tan⁻¹(15/20) = tan⁻¹(0.75) = about 36.9° south of west.
-- Its velocity = 25 m/s heading 36.9° south of west .
-- Heading west at 20 m/s across the 600-m channel
it takes the boat
(600 m) / (20 m/s) = 30 seconds
to hit the opposite bank.
-- In that 30 seconds, the current will carry the boat
(15 m/s) x (30 sec) = 450 meters downstream, south.