A sport car accelerate at the rate of 2.80m/s. How long does it take to reach its top speed of 60.0ml/h, starting from rest ?

A sport car accelerate at the rate of 2.80. How long does it take to reach its top speed of 60.0mil/h, starting from rest ?

9.58 seconds

Using one of the equations of motion;

v = u + at        ---------------------(i)

where;

v = final velocity of the car = 60mil/h

u = initial velocity of the car = 0 (since the car is starting from rest)

a = acceleration of the car = 2.80

t = time taken for the acceleration

(i) First convert the final velocity v = 60mil/h to m/s

1 mile = 1609.34m

60 miles = 60 x  1609.34m = 96560.6m

Also,

1 hour = 3600s

Therefore;

60mil/h = 96569.6m/3600s = 26.82m/s

(ii) substitute the values of v, u and a into equation (i)

=> v = u + at

=> 26.82 = 0 + 2.80t

=> 2.80t = 26.82

=> t = 26.82 / 2.80

=> t = 9.58s

Therefore the time taken to reach its top speed is 9.58s.

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )