Two objects were lifted by a machine. One object had a mass of 2 kilograms, and was lifted at a speed of 2 m/sec. The other had a mass of 4 kilograms and was lifted at a rate of 3 m/sec.
Answers
Answered by
5
Question:
Two objects were lifted by a machine. One object had a mass of 2 kilograms, and was lifted at a speed of 2 m/sec. The other had a mass of 4 kilograms and was lifted at a rate of 3 m/sec. which object had more kinetic energy while it was being lifted ?
Solution:
We know that,
KE = 1/2 mv²
=> KE = 1/2 mv²
=> KE = 1/2 × 2 × 2²
=> KE = 2²
=> KE = 4 joules.
Therefore,
- The kinetic energy is 4 Joules.
For second object,
KE = 1/2 m'v'²
=> KE = 1/2 m'v'²
=> KE = 1/2 × 4 × 3²
=> KE = 2 × 3²
=> KE = 2 × 9
=> KE = 18 Joules.
Therefore,
- The kinetic energy of 2nd object is 18 Joules.
Hence:
• 2nd Object have more KE.
Similar questions