Diagram 3.3 shows a remote control airplane (RC airplane). Diagram 3.3
Suggest modification to the batteries of the RC airplane so that it can fly higher and longer in the
air based on the aspects given.
(i) Voltage used:
Reason:
[2 marks]
(ii)Internal resistance, r of the battery :
Reason:
[2 marks]
(iii) Type of the battery used :
Reason:
[2 marks]

Suppose that a mass of 2 kg is attached a spring whose spring constant is 50. the system is damped such that b = 12 . the mass is set in motion with an initial velocity of -8 m/s at a position 0 meters from equilibrium. set up and solve a differential equation that models this motion. write your solution in the form a cos ( ω t − α ) where α is a positive number. use your solution to fill in the information below: what is the amplitude of the motion? what is the value of ω ? what is the phase shift?