A rocket takes of from rest on a launchpad with constant acceleration. After 30.0 s the rocket is 1100.0 m above the launch pad. Determine the rocket's acceleration in m/s2.

//(b) both involve the use of levers;

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.