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Answer :
That poor child weighs 1,818 pounds ! He can't stand up, can't hold himself upright on a skateboard, has probably been banned from every hill in town, and no 1-kg skateboard can hold all of him.
This must be a big part of the reason why his speed down the hill is only 0.632 meter/second . . . about 1.4 miles per hour.
You can WALK at east twice that fast.
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Rewritten by : Barada
KE= 0.5mv^2
165J= 0.5×(825kg+1kg)×v^2
165J = 413kg×v^2
v^2=165J÷413kg
v^2=0.39952 m^2/s^2 (5s.f.)
v= √0.39952= 0.632 m/s (3.s.f.)
