At what distance behind Jenny should Linda be when Jenny starts running?

A track team is practicing for a 4 x 100 m relay race. The first runner, Linda, is running at a constant speed of 8.6 m/s. The next runner, Jenny, will be starting from rest at the 80 m mark. She has an acceleration of 1.0 m/s2. Ideally the two runners meet at the 100 m mark to hand over the baton. At this point, Jenny is still accelerating.

a) At what distance behind Jenny should Linda be when Jenny starts running? (Assume for simplicity that there is no distance between the two runners when the switch happens.)

b) How long does it take Jenny to run from the 80-m mark to the 100-m mark?

c) What’s Jenny’s speed at the 100m mark?
Linda Jenny

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Hello!
no.1
03 October 2012
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