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m= 700 kg
u= 90 km/hr = 90 * 5/ 18 m/s = 25 m/s
v = 36 km/hr = 30 * 5/18 m/s = 10 m/s
t = 10s
a = ?
F = ?
a= (v-u) /t
a = (10 - 25) / 10
a = -15/10 = -1.5 m/s ²
negative sign means car is retarding
we know that Force = mass * acceleration
so, 700 * ( - 1.5)
F = -1050 N
therefore ∴ the force applied by the brakes is 1050 N in the opposite direction .
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