Answer: Hydrogen
Explanation: Which element would you expect to gain one electron in a chemical reaction ? HYDROGEN
Non-metals are more likely to gain electrons!
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Answer:
a. 3 s.
Explanation:
Given;
angular acceleration of the wheel, α = 4 rad/s²
time of wheel rotation, t = 4 s
angle of rotation, θ = 80 radians
Apply the kinematic equation below,

Given initial angular velocity, ω₀ = 0
Apply the kinematic equation below;

Therefore, the wheel had been in motion for 3 seconds.
a. 3 s.
The final velocity is a vector quantity that measures the speed and direction of a moving body after it has reached its maximum acceleration
3.87 i think but if its not correct then let me know.