p04 077

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77. With no acceleration in the x direction yet a constant acceleration of 1.4 m/s

2

in the y direction, the

position (in meters) as a function of time (in seconds) must be



r = (6.0t)ˆi +



1

2

(1.4)t

2



ˆj

and 

v is its derivative with respect to t.

(a) At t = 3.0 s, therefore, 

v = 6.0ˆi + 4.2ˆj m/s.

(b) At t = 3.0 s, the position is 

r = 18ˆi + 6.3ˆj m.


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