A sport car accelerates from zero to 30 mph in 2 seconds. How long does it take

Question

A sport car accelerates from zero to 30 mph in 2 seconds. How long does it take to accelerate from zero to 60 mph, assuming that the power output of the engine is independent of velocity and neglecting friction and air resistance?
A- 4 sec B- 6 sec C- 8 sec D- 16 sec E- None of these A sport car accelerates from zero to 30 mph in 2 seconds. How long does it take to accelerate from zero to 60 mph, assuming that the power output of the engine is independent of velocity and neglecting friction and air resistance?
A- 4 sec B- 6 sec C- 8 sec D- 16 sec E- None of these
A- 4 sec B- 6 sec C- 8 sec D- 16 sec E- None of these

Explanation / Answer

Answer is A

Acceleration = a = v/t = 30/(2/60) = 900 m/h^2

Using equation of motion

v = u + at

v = 60 mph

u = 0

t = 60/900 h = 4 s

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