Question

question
type the correct answer in each box.
li is riding her bicycle at 8.0 m/s. she slows down to 4.0 m/s. her change in velocity is m/s. if li takes 2 seconds to make this change, her acceleration is m/s².

Explanation:

Step1: Calculate change in velocity

Change in velocity ($\Delta v$) is final velocity ($v_f$) minus initial velocity ($v_i$). So $\Delta v = v_f - v_i = 4.0 - 8.0 = -4.0$ m/s. The negative sign indicates deceleration, but we can report the magnitude or the signed value as per context. Here, the change in velocity is $4.0 - 8.0 = -4$ (or -4.0) m/s.

Step2: Calculate acceleration

Acceleration ($a$) is change in velocity divided by time ($t$). So $a=\frac{\Delta v}{t}=\frac{-4.0}{2} = -2.0$ m/s². The negative sign indicates deceleration.

Answer:

-4 (or -4.0)；-2 (or -2.0)