Question

what is the work done to be done to increase the velocity of a car from 30km/h to 40km/h if the mass of car is 1500kg

Answer 1

heya

this is your answer

given

Initial velocity of the car = 30 km/h
Final velocity of the car = 40 km/h.
Mass of the car = 1500 kg.
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We know that work done = change in kinetic energy.

Kinetic energy =
$\frac{1}{2} m {v}^{2}$
So, work done = final kinetic energy - initial kinetic energy.

$= \frac{1}{2} m {v}^{2} - \frac{1}{2} m {u}^{2}$
$= ( \frac{1}{2} \times 1500 \times 40 \times 40) - ( \frac{1}{2} \times 1500 \times 30 \times 30 \\ =( 1500 \times 20 \times 40) - (1500 \times 15 \times 30) \\ = (30000 \times 40) - (22500 \times 30) \\ = 1200000 - 675000 \\ = 525000$
Hence, work done is 525000 J or 525 KJ.

Hope this helps......

Answer 2

Answer:

u are wrong

Explanation:

I am giving the answer

final 30 kmh 30/2

intial 40km40/2

we have to convert itt

then the sum is rigatt