Question

20. An Olympic-class sprinter starts a race with an acceleration of 4.50 m/s (a What is her speed 2 40 s later? D) s graph of her position vs time for this period.

just part A

Answer 1

a)

acceleration

$a = 4.5 \frac{m}{s^{2}}$

time $t = 2.4 s$

the kinematic equation $v = v_{0} + at$

$v_{0} = 0$

$v = v_{0} + at$

$v = 0 + 4.5 \frac{m}{s^{2}}\times 2.4 s$

$v = 10.8 \frac{m}{s}$