Question

Hillary is walking to school at 1.3 m/s. She looks at her watch and realizes she is going to be late. She starts to hurry by increasing her rate by 0.090 m/s squared. What is Hillary's speed after 10 seconds?

Answer 1

initial speed by which Hilary is walking = 1.3 m/s

Now the rate of increase in her speed that is her acceleration is given by

$a = 0.090 m/s^2$

now we need to find her final speed after t = 10 s

so here we can use the kinematics equation in order to find the final speed

$v_f = v_i + at$

now plug in all data in the above equation

$v_f = 1.3 + (0.090 * 10)$

$v_f = 1.3 + 0.90$

$v_f = 2.2 m/s$

so here the final speed will be 2.2 m/s after she accelerates