Question

How much kinetic energy does a 7.2-kg dog need to make a vertical jump of 1.2 m? (The acceleration due to gravity is 9.8 m/s2.)

Answer 1

How much kinetic energy does a 7.2-kg dog need to make a vertical jump of 1.2 m?
Answer:85 Joule (approx)Step-by-step explanation:Potential energy at highest pointP.E = mgh = 7.2 kg × 9.8 m/s2×1.2 m≈85 JouleThis is the kinetic energy required for dog to jump a height of 1.2 m.

hope this helps!

Answer 2

Kinetic energy of dog is 84.67 Joules

Step-by-step explanation:

Given that,

Mass of the dog, m = 7.2 kg

We have to find the kinetic energy does a 7.2-kg dog need to make a vertical jump of 1.2 m. We know that the energy of a system remains conversed. At highest point there is only potential energy. So, while taking a vertical jump the potential energy gets converted to potential energy.

So,
`E_k=mgh`

here, h = 1.2 m

`E_k=7.2* 9.8* 1.2`

`E_k=84.67\ Joules`

Hence, the kinetic energy needed to make a vertical jump is 84.67 Joules.