Question

A car weighing 12 kN has
speed of 20° ms. Find its
(240 kJ)
kinetic energy.​

Answer 1

Weight of the car = 12 kN = 12 × 1000 N = 12000 N

Speed = 20 m/s

We know,

Kinetic energy = ½(mv²)

[m = mass; v = velocity.]

∴ Kinetic energy = ½[12000 N (20 m/s²)²]

= ½(120000 N × 400 m²/s²)

= ½(48000000 N m²/s²)

= 24000000 J = 24000 kJ

Answer 2

Answer:

24000000 J or 24000 KJ

Explanation:

Weight of the car = 12 kN = 12 × 1000 N = 12000 N

Speed = 20 m/s

We know,

Kinetic energy = ½(mv²)

[m = mass; v = velocity.]

∴ Kinetic energy = ½[12000 N (20 m/s²)²]

= ½(120000 N × 400 m²/s²)

= ½(48000000 N m²/s²)

= 24000000 J = 24000 kJ