First we have to establish that the number of protons is equivalent to the atomic number of element. Here I am assuming that you are referring to Potassium (K) - 40. Potassium, stable or unstable has 19 protons.
Answer:
20 m/s/s
Explanation:
F=ma, 350=17.5 * a, a=20 m/s/s
30 km/h * 17 h = 30*17 km/h *h
= 510 km
The current in the 50 Ω resistor is A) 1.2 A