Question #962dd

1 Answer
MeneerNask
Apr 27, 2016

You first convert mph into m/s.

Explanation:

The conversion rate: #1mph=0.447m//s# (you can look that up)
#->30mph=30xx0.447=13.411m//s#

Kinetic energy #E_k=1/2xxmxxv^2#

#E_k=1/2xx1200xx13.411^2=107916J~~108kJ#

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