A car that decreases its speed from 100 km/h to 20 km/h undergoes ______ acceleration.
negative?
100/20 = 5
A racing car travels with a constant tangential speed of 82.2 m/s around a circular track of radius 615 m.
(a) Find the magnitude of the car's total acceleration.
v^2/r
so 82.2^2/615 = 10.99 m/s^2
and the direction of the acceleration will
be toward the center of circle
To determine the type of acceleration experienced by a car, we need to calculate its change in velocity. In this case, the car's velocity decreases from 100 km/h to 20 km/h, resulting in a change of -80 km/h.
Acceleration is defined as the rate of change of velocity with respect to time. In other words, it is the change in velocity divided by the time taken for that change.
Since we do not have information about the time it took for the car to decrease its speed, we cannot calculate the exact magnitude of acceleration. However, we can determine the type (or direction) of acceleration.
In this scenario, the velocity change is negative (from 100 km/h to 20 km/h), indicating that the car has decelerated or slowed down. Deceleration is a form of negative acceleration, where the change in velocity is in the opposite direction of the initial velocity.
Therefore, the car undergoes "negative acceleration" or "deceleration" as it decreases its speed from 100 km/h to 20 km/h.