Question

Starting from rest, a car accelerates at a constant rate of 4.0m/s² for a time of 5 seconds. What is the velocity of the car at 5 seconds?

a) 5 m/s
b) 10 m/s
c) 15 m/s
d) 20 m/s

Answer 1

The velocity of the car at 5 seconds is 20 m/s.

Step-by-step explanation:

Given that the car starts from rest, accelerates at a constant rate of 4.0 m/s², and the time interval is 5 seconds, we can use the equation: v = u + at

Where:

• v is the final velocity
• u is the initial velocity (0 m/s since the car starts from rest)
• a is the acceleration (4.0 m/s²)
• t is the time interval (5 seconds)

Plugging in the values, we have:v = 0 + (4.0 m/s²)(5 s) = 20 m/s .Therefore, the velocity of the car at 5 seconds is 20 m/s (option d).