A car driver adjusts the pressure on a car’s brakes so that the car travels at constant speed down a hill from P to Q. The magnitude of the change in the car’s kinetic energy is $∆E_k$. The magnitude of the change in its gravitational potential energy is $∆E_p$.
Which statement is correct?

1 )
$∆E_k$>$∆E_p$
2 )
$∆E_k$=$∆E_p$
3 )
$∆E_p$>$∆E_k$>0
$∆E_k$=0
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