- #1
bakoo
- 19
- 0
Homework Statement
Q1. In a 100m sprint the athlete can be assumed to accelerate linearly for the first 60m (which takes 7s to cover). For the remaining 40m the running speed is constant.
a) Determine the acceleration over the initial 60m. (5 marks)
b) Draw a graph of
i) acceleration v time (2 marks)
ii) speed v time (2 marks)
iii) distance v time (2 marks)
c) Determine the time taken to complete 100m both graphically and numerically. (4 marks)
Homework Equations
s = ut + 0.5at^2
s = displacement
t = time
a = acceleration
v = u + at
v = velocity
u = initial velocity
t = time
s = 0.5(u+v)t
The Attempt at a Solution
Acceleration = 2.163 m/s^3
Velocity = 15.141m/s
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My problem is when i use other kinematic equations i don't get back to the same values as given in the problem.
when using formula
V^2 = U^2 +2as
i get a different velocty
and when i use formula
s = 0.5at^2
i get a different displacement.
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So have i solved this corrent?
Any advice on what is the corrent formula or what is the correct answer would be most appreciated... thanks