Question

The velocity of a car increase from
54 km/hr to 72 km/hr. How much is
the work done if the mass of the car
is 1500 kg ?​

Answer 1

Answer:

131.25 kJ

Explanation:

54 kmph = 54 × 5/18 m/s = 15 m/s

72 kmph = 72 × 5/18 m/s = 20 m/s

Work = Change in Kinetic energy

= 0.5m(v² - u²)

= 0.5 × 1500 kg × [(20 m/s)² - (15 m/s)²]

= 131,250 J

= 131.25 kJ