Question

Referring `a-s` diagram in , find the velocity after particle travel `120 m` from starting. Assume `v_(0)=0`.
.

Answer 1

`a=-(s)/(20)+200`
`underset(0)overset(v)(int)v dv =underset(0)overset(250)(int)(-(s)/(20)+20)ds rArr (v^(2))/(2)=[-(s^(2)/(40)+20)s]_(0)^(250)`
`(v^(2))/(2)=-((250)^(2))/(40)+20 xx250`
`rArr v^(2)= 6875 rArr v=25 sqrt11 ms^(-1)`.