A car is moving on circular path of radius \( 100 \mathrm{~m} \) such that its speed is increasi...

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A car is moving on circular path of radius \( 100 \mathrm{~m} \) such that its speed is increasing at the rate of \( 5 \mathrm{~m} / \mathrm{s}^{2} \). At \( t=0 \) it starts from rest. What is the radial acceleration of car at the instant it makes one complete round trip?
(1) \( 20 \pi \mathrm{ms}^{-2} \)
(2) \( 7 \pi \mathrm{ms}^{-2} \)
(3) \( 5 \mathrm{~ms}^{-2} \)
(4) None of these
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