Question

a body travel 10 metre in first three second and 15 metre in the next four seconds what is the velocity at the end of 8th second​

Answer 1

Answer:

4.1 m/s

Explanation:

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 get

25 = ((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

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