Question

What is the work to be done to increase the velocity of a car from 18 km /h

to 36 km /h if the mass of the car is 2000 kg?​

Answer 1

Answer:

hii sis do acceleration

Step-by-step explanation:

hope this helps...

Answer 2

Answer:

If the mass of the car is 2000 kg, the work to be done to increase the velocity of a car from 18 km /h  to 36 km /h will be $75000\ J$

Step-by-step explanation:

Let m be the mass and v is the velocity of the object. Then the expression for kinetic energy is given by,

Kinetic energy (K.E) = $\frac{1}{2} m v^{2}$      ...(1)

According to the work-energy theorem,

Work done = Change in kinetic energy

That is,

$W = \frac{1}{2}m\times (v^{2} -u^2)$                  ...(2)

In the question, it is given that,

$m = 2000\ kg$

$v= 18\ km/h = 18\times \frac{5}{18} = 5\ m/s$

$v= 36\ km/h = 36\times \frac{5}{18} = 10\ m/s$

Substitute the values into equation (2),

$W = \frac{1}{2}\times 2000\times (10^2-5^2) =75000 \ J$

Thus the work done =  $75000 \ J$