An arrow is shot into air. Its range is 200 m and its time of flight is 5 s. If g = 10 ms-2, then horizontal component of velocity and the maximum height will be respectively

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20 ms-1 , 62.50 m

40 ms-1 , 31.25 m

80 ms-1 , 62.5 m

None of these

answer is B.

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Detailed Solution

Time of flight, T=2uyg⇒ uy=gT2=25 ms-1 Now, H=uy22g=(25)220=31.25 mFurther, R=uxT⇒ ux=RT=40 ms-1

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