Question

fill in the blank question the initial velocity of a car is 30 m/s westwards. after some time, the car is traveling 45 m/s eastwards. during this interval, the car has a δv = m/s eastwards.

Explanation:

Step1: Define direction sign

Let eastwards be positive (+), westwards be negative (-).
Initial velocity $v_i = -30$ m/s, final velocity $v_f = 45$ m/s.

Step2: Calculate velocity change

Velocity change $\Delta v = v_f - v_i$
$\Delta v = 45 - (-30) = 45 + 30$

Answer:

75