How much of 100-gram sample of cobalt-
57 will remain after 10 days?

Iam looking for this answer too!

490 n  f=125n a=2.5m/s2

The answer is -6hope this

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.