An astronaut has left the International Space Station to testa new space scooter. Her partner measures the following velocity changes, each taking place in a 10-s interval. What are the magni- tude, the algebraic sign, and the direction of the average accelera- tion in each interval? Assume that the positive direction is to the right.
(a) At the beginning of the interval the astronaut is moving toward the right along the x-axis at and at the end of theinterval she is moving toward the right at .
(b) At the beginning she is moving toward the left at and at the endshe is moving toward the left at
(c) At the beginning she is moving toward the right at and at the end she is mov-ing toward the left at 15.0 m>s