Define acceleration. A bus decreases its speed from 90 km/hr to 18 km/hr in 10 s. Find the acceleration of the bus.
Answers
Answer:
Acceleration is the rate of change of velocity. Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changed.
Speed is defined as the rate at which an object covers a distance.
Acceleration is the rate of change of velocity.
Answer: The acceleration of the bus is -1.12m/s2
Let us understand the relationship between acceleration, speed and time.
Explanation:
Acceleration a = (V - U) / t
Given: Initial velocity (U) = 80 km/hr = 80 × 5/18 = 400/18 = 22.2 m/sec
Final velocity (V) = 60 km/hr = 60 × 5/18 = 300/18 = 16.6 m/sec
Acceleration a = (V - U) / t
= (16.6 - 22.2)/5
= -5.6/5
= -1.12 m/s2
Negative sign indicates that the velocity is decreasing.
I hope it is helpful for you.