Question

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

Answer 1

Answer

• 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 (v² - u²)

= 1/2 x 1500 x (20² - 10²)

=  225000 J

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