Question

Calculate the kinetic energy of a 1000 kg car traveling at 60km/h?

Answer 1

Answer:

The answer will be 1.25 × 10^6 J.

Explanation: As we know that,

K.E= 1/2 m v^2

Now, we have given,

m = 1000 Kg

v = 60 Km/h

To get the S.I. we have to convert velocity into m/s

So, v = (60 ×1000) / 3600

v = 50 / 3 m/s

According to formulae of kinetic energy,

K.E. =1/2mv^2

put the values of the varible in this equation.

Hence, K.E.= 1/2 (1000kg)(50/3)^2

= 1 / 2 (1000) (2500/9)

=1/2 (2500000/9)

=1250000/9 J

Therefore, 1250000/9 = 1.25 × 10^6 J.

That's all.

Answer 2

Answer:

Kinetic Energy of a 1000 Kg car travelling at 60 Km/hrs is 138.88 J.

Explanation:

• Kinetic Energy of particle of mass, m moving with velocity, v is K.E. = ½mv² .

Given that :

• mass of car, m = 1000 Kg
• speed of car, v = 60 Km/hrs

Solution :

• Speed of car is 60 km/hrs = (60x 5)/18 = 50/3 m/sec.
• The Kinetic Energy of car is

$K.E. = \frac{1}{2} m {v}^{2} \\ K.E. = \frac{1}{2} \times 1000 \times \frac{50}{3}\times \frac{50}{3}\\ K.E. = \frac{1250000}{9}\: J \\ K.E. = 138.88 \: KJ$

• Hence, kinetic energy of car is 138888.88 J or 138.88KJ .