a body travels 10 m in first 3 seconds and 15 m in the next 4 seconds what is the velocity at the end of 8th second
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s=ut+at² S=ut+0.5at² 10 = u*3 +0.5 *a*3*3 -----1
25 = u*7 + 0.5*a*7*7 ------2
eq 1 => u=(10-4.5*a)/3Putting above value in eq 2 we get25 = ((10-4.5*a)*7)/3 + a*24.5
So, a = 5/42 and u =3.15
Now, v = 3.15 + 5/42(8)
So, v=4.1 m/s
25 = u*7 + 0.5*a*7*7 ------2
eq 1 => u=(10-4.5*a)/3Putting above value in eq 2 we get25 = ((10-4.5*a)*7)/3 + a*24.5
So, a = 5/42 and u =3.15
Now, v = 3.15 + 5/42(8)
So, v=4.1 m/s
Ishan1511:
wrongful
oh ok. i thought it was right
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