Asports car accelerates from 0 to 30 mph in 1.5 s. how long would it take to accelerate from 0 to 60 mph, assuming the power of the engine to be independent of velocity and neglecting air drag?

6 s

Explanation:

given,

Sports car accelerate from 0 to 30 mph in 1.5 s

time taken to accelerate  0 to 60 mph = ?

The power of the engine is independent of velocity and neglecting friction

power =

P = constant  

the kinetic energy for 60 mph larger than this of 30 mph

 =

 =

 =

 = 4

gain in kinetic energy  = P x t

time = 4 x 1.5

       = 6 s

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures