I have no idea where to start with this one: A parachutist jumps out of an airpl

Question

I have no idea where to start with this one:
A parachutist jumps out of an airplane and accelerates withgravity to a maximum velocity of 60m/s. He then pulls theparachute cord and after a 4.0s constant deceleration, decends at10m/s for 60s, reaching the ground. a) How far does the parachutist fall while accelarting to60m/s? b) What is the acceleration of the parachutist as he slowsfrom 60m/s to 10m/s? c) What was the altitude of the airplane of the airplane atthe time of the jump? I have no idea where to start with this one:
A parachutist jumps out of an airplane and accelerates withgravity to a maximum velocity of 60m/s. He then pulls theparachute cord and after a 4.0s constant deceleration, decends at10m/s for 60s, reaching the ground. a) How far does the parachutist fall while accelarting to60m/s? b) What is the acceleration of the parachutist as he slowsfrom 60m/s to 10m/s? c) What was the altitude of the airplane of the airplane atthe time of the jump?

Explanation / Answer

Initial velocity u = 0 final velocity v = 60 m / s accleration a = 9.8 m / s ^ 2 from the relation v ^ 2 - u ^ 2 = 2aS      distance S = v ^ 2 /2a    Since u = 0                       = 183.67 m (b). Accleration a ' = ( V - U ) / t '                              = ( 10 - 60 ) / 4                              = -12.5 m / s ^ 2 (c). distance after 60 m / s speed acquired is S ' = [ V ^ 2- U^2 ] / 2a '                                                                            = 140 m So, total altitude H = S + S'                             = 323.67 m

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