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Average speed: v = ds/dt

Velocity: It is same as speed but it has direction because it is a vector quantity.

Acceleration: a = dv/dt

An object moving with constant velocity has zero acceleration.

Fundamental kinematic equations:

Vf = Vi + at

S = Vi + ½ at^2

Vf^2 = Vi^2 + 2aS

Where, Vf = final velocity

Vi = Initial velocity

S = distance

a = acceleration

And t = time

Centripetal acceleration, a = 3.6 m/s^2

And radius of the circular path, r = 5.4 m

We have the equation,

Centripetal acceleration, a = V^2/r

Where, V = Linear velocity.

3.6 = V^2/5.4

V = 4.4 m/s.

Initial velocity, Vi = 85 Km/hr = 85 x 60 x 60 /1000 m/s

= 306 m/s

Final velocity, Vf = 95 Km/hr = 95 x 60 x 60/1000 m/s

= 342 m/s

Now, we have the equation for acceleration,

a = (342 – 306)/3.5 = 10.28 m/s^2.