Respuesta :

Answer:

The mass of a dog on skateboard would be 10 kg.

Explanation:

To solve this problem you have to use Newton´s second law F = m x a

20 N = m x 2 (m/s²) ⇒ 20 N/ 2 m/s² = m ⇒ m = 10 kg.

The mass of a dog on skateboard would be 10 kg.