7. A particle after starting from rest, experiences constant acceleration for 20 sec. If it covers a distance si in first 10 sec, then the distance covered during next 10 sec will be (1) Si (2) 251 (3) 351 (4) 451

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Let constant acceleration is a distance travels in 20 seconds ( s=0^{*} 20+a^{*} 20^{2} / 2 ) ( s=200 a ) distance travels in first 10 seconds ( s 1=0^{*} 10+a^{*} 10^{2} / 2 ) s1 ( =50 a ) distance travels in next 10 seconds ( s 2=s-s 1 ) ( s 2=200 a-50 a=150 a ) ( s 2 / s 1=150 a / 50 a=3 )

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