Question

what is the work done to increase the velocity of a car from 36 km/hr
to 72 kilometre per hour if the mass is 1500 kg​

Answer 1

Step-by-step explanation:

(a) It states that energy can neither be created nor be destroyed.

(b) Given m = 1500 kg,

u = 36 km h^-1 = 10 m s^-1,

v = 72 km h^-1 = 20 m s^-1,

W = ?

Work done = Change in kinetic energy =1/2 m (v^2-u^2)=1/2 x 1500 x (20^2 -10^2) = 225000 J

The work done is positive.

© It has maximum potential energy at its extreme position and maximum kinetic energy at the mean position.

Answer 2

Answer:

Given that :-

Mass = 1500 kg

Initial velocity = 36 × 5/18 = 10 m/s

Final Velocity = 72 × 5/18 = 20 m/s

To Find :-

Work done

Concept :-

Here, Work done = Change in Kinetic Energy

And, we will use the formula of "½m (v - u)"

Solution :-

As we know that

½ × 1500 (20² - 10²)

750 (400 - 100)

750 × 300

225000 J

Answer 3

Answer:

Given that :-

Mass = 1500 kg

Initial velocity = 36 × 5/18 = 10 m/s

Final Velocity = 72 × 5/18 = 20 m/s

To Find :-

Work done

Concept :-

Here, Work done = Change in Kinetic Energy

And, we will use the formula of "½m (v - u)"

Solution :-

As we know that

½ × 1500 (20² - 10²)

750 (400 - 100)

750 × 300

225000 J