Question

what is the work to be done to increase the velocity of car 30 km/h to 60 km/ h if the mass of the car is 1500kg. in calculation.

Answer 1

Answer:

W=k.e. final-k.e. initial

=1/2 m(vfinal)^2-1/2m(v initial)^2

1/2×1500×60×60 - 1/2× 1500×30×30

1/2×1500(3600-900)

750×2700

=2025000joule work has to be done

thanku .

Answer 2

Answer:

Here your answer

Mass of the car, m = 1500kg

initial velocity of car, u = 30 km h-¹

30 X 1000m

= 30000

60x60

= 3600

= 30000 ➗ 3600

= 25/3 ms-¹

similarly, the final velocity of the car,

v = 60 km h-¹

= 50/3 ms-

Therefore, the initial kinetic energy of the car,

Ek ki =½m u²

= ½ x 1500kg x (25/3ms-¹)

= 156250/3J

The final kinetic energy of the car,

Ekf = ½ x 1500kg (50/3ms-¹)

= 625000/3J

Thus, the work done = change in kenitic energy

= 625000/3j ➗ 156250/3j

= 156250J

Explanation:

hope it's will help u

Answer by Kalan Danz