Question

a truck of mass 100 kilograms increase its speed from 36 kilometre per hour -1 to72 kilometre per hour -1 find the increase in its kinetic energy?​

Answer 1

Given:-

• Mass of truck (m) = 100kg

• Initial velocity (u) = 36 km/h

• Final velocity (v) = 72km/h

To Find:-

• Increase in kinetic energy

Solution:-

Firstly we convert the speed into m/s

Initial speed = 36×5/18 = 10m/s

Final speed = 72×5/18 = 20m/s

As we know that Kinetic Energy is the energy of the body due to virtues of its motion.

→ K.E = 1/2mv²

Using this formula

→ Increase in kinetic energy = Final Kinetic - Initial Kinetic

→ Increase in K.E = K.Eᶠ - K.Eⁱ

Substitute the value we get

→ Increase in K.E = 1/2×100 ×20² - 1/2 × 100×10²

Taking common both side

→ Increase in K.E = 1/2×100 (400-100)

→ Increase in K.E = 50 × 300

→ Increase in K.E = 15000J

∴ The increase in Kinetic Energy is 15000 Joule.

Answer 2

Explanation:

15000 joule

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