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Formula I think to use is to basratardise this formula which uses potential energy to find the distance

Which is

Ek = ½ mv2

DeltaEg = mg Delta h

Which equates to

mg Delta h = ½ mv2

which would change to

delta h = v²/2g

I would change h for d=distance

V² would equal 48 km h−1 converted to m sˉ¹

g would I would change to a for acceleration (deceleration)= 2.68 m s−2

so it would be

delta d = v²/2a

can I do this? My thinking is that energies are conserved so it would be ok to do this?