Phys 113 Problem Set 1 Solutions 1) 90 kmh1000 m25 m sh3600 skmcv==, 750 kmh1000 m20.83 m sh3600 skmtv()25 m sccxvtt, ( )0100 m20.83 m stttxxvt=+=+tctxc=, 25 m s100 m20.83 m s=+, ( )4.16 m s100 mt=, 24 s0.4 mint2) No, a change in speed would indicate a change in the magnitude of velocity. Yes, the object could be changing directions while moving at a constant speed. Yes, speed is just the magnitude, which is always positive, of the velocity. No, speed is just the magnitude, which is always positive, of the velocity. 3) (a) 222.0 m4.6 m s1.1 m sx=−+()2212.0 m4.6 m s1.0 s1.1 m s1.0 s1.5 mx+=−()( )2222.0 m4.6 m s2.0 s1.1 m s2.0 s2.8 mx+=−()( )2222.0 m
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