Answer:
a 
b
Explanation:
Generally the force constant is mathematically represented as

substituting values given in the question
=> 
=> 
Generally the workdone in stretching the spring 3.5 m is mathematically represented as

=> 
=> 
Generally the workdone in compressing the spring 2.5 m is mathematically represented as
=>
=>
Answer:
a) The brake force = -535.7N
b) acceleration = - 1.2m/s^2
Explanation: Please find the attached files for the solution.
Answer:
a) 
b) 
c)
,
Explanation:
From the question we are told that:
Mass 
Velocity 
Coefficient of Rolling Friction 
a)
Generally the equation for The Propulsion Force is mathematically given by



b)
Therefore Power Required at




c)



Generally the equation for Work-done is mathematically given by



Therefore
Efficiency

Since
Energy in one gallon of gas is

Therefore

