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LittlePanther07
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a rollercoster car and passengers of total mass 1800kg starts from rest at 80m above the ground. Ignoring air resistance and friction what will the speed be:

At ground level

At top of the next peak which has height of 30m

Take gravity 10N/kg

i calculated it as 1697m/s, by converting gravitational potentional energy to kinetic energy to calculate the velocity/speed.

Did you do the same?

Verified Answer :

mgh=(mv^2)/2
v^2=2mgh/m
v^2=2gh
v^2=2  10 m/s^2  80 m
v^2=1600 m^2/s^2
v=40 m/s

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