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Question

Brad is working on a speed problem in physics class. The problem tells him that a girl runs from her house to the park 0.05 km away in 10 s. Brad calculates that her speed is 0.005 m/s. Is he correct? If not, explain the flaw or flaws in his problem solving process.

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Answer 1 · 2018-03-10T22:11:45

no

#0.05km = 0.05 * 1000m#

#= 50m#

#s = d/t#

where #d# is distance in metres #m#,

#t# is time in seconds #s#,

and #s# is speed in metres per second #m//s#.

here, #d = 50m# and #t = 10s#

#d/t = 50/10#

#s = 5 m//s#

the speed could also be expressed as #0.005 km//s#, but not #5 m//s#;

the number would need to be multiplied by #1000# since the unit #km# was converted to #m#.