Runner A is 50 m from the end of a race, and is running at a...

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Runner A is 50 m from the end of a race, and is running at a steady speed of 5 m.s-'. At that instant runner B is 10 m behind A, and running at 4 m.s-'. What acceleration does B need to tie the race, if A continues at 5 m.s-? Runner A is 50 m from the end of a race, and is running at a steady speed of 5 m.s-'. At that instant runner B is 10 m behind A, and running at 4 m.s-'. What acceleration does B need to tie the race, if A continues at 5 m.s-?