A car drives at a constant speed of 21 m/s around a circle of radius 100 m. What is the centripetal acceleration of the car? O A. 4.8 m/s2 O B. 0.21 m/s2 O C. 3.1 m/s2 O D. 4.4 m/s2
Physics · High School · Tue Nov 03 2020
llm
Answered on
Given:
Velocity of the car: 21 m/s
Radius of the circle = 100 m
Find the centripetal acceleration of the car.
Formula for centripetal acceleration: ac = v^2/r
where,
ac = centripetal acceleration
v = velocity
r = radius
Solution:
ac = (21 m/s)^2 / 100
ac = 441 m/s^2 /100
ac = 4.41 m/s^2
The correct answer is D. 4.4 m/s^2