problem03_07

# University Physics with Modern Physics with Mastering Physics (11th Edition)

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3.7: a) b) . ˆ ) s m 4 . 2 ( ˆ 2 ˆ ] ) s m 4 . 2 [( ˆ ) s m 4 . 2 ( ˆ 2 ˆ 2 2 j j a j i j i v - = - = - = - = β β α t t c) At s 0 . 2 = t , the velocity is j i v ˆ ) s m 8 . 4 ( ˆ ) s m 4 . 2 ( - = ; the magnitude is s m 4 . 5 ) s m 8 . 4 ( ) s m 4 . 2 ( 2 2 = - + , and the direction is ( 29 ° - = - 63 arctan 4 . 2 8 . 4 . The acceleration is constant, with magnitude 2 s m 4 . 2 in the y - -direction. d) The velocity vector has a component parallel to the acceleration, so the bird is speeding up. The bird is
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