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## Homework Statement

A car is travelling at initial speed 5.5ms

^{-1}. The car is on a decline of 8

^{o}. The brakes are used and the car stops after travelling 10m along the road (with no skidding).

At the moment when kinetic energy is 51% lower than the initial value,

ﬁnd the corresponding percentage fall in speed.

## Homework Equations

E

_{k}= 1/2mv

^{2}

## The Attempt at a Solution

E is 51% lower, so [tex]\frac{2(0.49)Ek}{m}[/tex]=v

^{2}

Clueless?!