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CBSE Class 9 Answered

a body covers 200m in 2s &220m in next 5s. what is the speed of body in 7th second?
Asked by avi123 | 13 May, 2008, 10:11: AM
answered-by-expert Expert Answer

use the formula s = ut + at2/2 put the values of t and s in this equation and find the equation in terms of u and a

now again use use the same formula s = ut + at2/2 put the values of t and s in this equation  for second case again find the equation in terms of u and a

solve the two equation and find the value of u and a , now use the formula v = u+at and find the value of v by subsituting the values of u , a and t

Answered by | 24 Jun, 2008, 11:48: AM

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