The electrostatic force between two charges is given by

where
ke is the Coulomb's constant
q1 and q2 are the two charges
r is the separation between the charges
In our problem,



Therefore the electrostatic force is
Answer:
148(m/s)
Explanation:
V_final = V_current + (acceleration) x (time)
= 4 + 80 x 1.8 = 148 (m/s)
Given that : d = 5sin(pi t/4), So, maximum displacement, d = 5*(+1) = 5 Also, maximum displacement, d = 5*(-1) = -5
Explanation:
Exothermic
Because here Energy is released.