Question

Read through the and calculate the predicted change in kinetic energy of the oblect compared to 50 kg ball traveling at 10 m/s . 50 kg ball traveling at 20 n / s would havekinetic energy 50 kg traveling at 5 m/s would have energy 50 kg person falling at 10 m/s would havekinetic energy

Answer 1

7500 J

-2475 J

0 J

Step-by-step explanation:

Kinetic energy, KE is given by
`0.5mv^(2)` where m is the mass of an object and v is the velocity.

Change in kinetic energy is calculated by
`\triangle KE=0.5m(v_f^(2)-v_i^(2))`

First case

We compare 50 kg travelling at 10 m/s to 50 kg at 20 m/s

`\triangle KE=0.5*50(20^(2)-10^(2))=7500 J`

Second case

We compare 50 kg travelling at 10 m/s to 50 kg at 5 m/s

`\triangle KE=0.5*50(5^(2)-10^(2))=-2475 J`

Third case

We compare 50 kg travelling at 10 m/s to 50 kg at 10 m/s

`\triangle KE=0.5*50(10^(2)-10^(2))=0 J`