# physics

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A racing car reaches a speed of 40 m/s. At this instant, it begins a uniform negative acceleration, using a parachute and a braking system, and comes to rest 5.0 s later.
(a) Determine the acceleration of the car.
(b) How far does the car travel after acceleration starts?

• physics -

a) use v=u +at solve for a
b) use v^2=u^2+2as solve for s.

v is final vel; u is initial vel; t is time and a is accel. S is displacement; or distance in this case.

• physics -

8

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