Plz solve with proper explanation fast.

Plz solve with proper explanation fast. constant rate comes to 'S t. then max•murn

Dear Student,
                      Let maximum velocity is v then for first part v=αt1t1=vα--1for second part v=βt2t2=vβ---2add 1 and 2 we gett1+t2=t=vα+vβv=αβtα+β
Regards

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