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A car traveling at the 36km /hr speeds up to 72km/hr in 5 seconds. What it is acceleration if the same car stops in 20 seconds. What is the retardation
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Most Upvoted Answer
A car traveling at the 36km /hr speeds up to 72km/hr in 5 seconds. Wha...
Answer:

Acceleration:

  • Initial velocity (u) = 36 km/hr

  • Final velocity (v) = 72 km/hr

  • Time (t) = 5 seconds


To find acceleration (a) we can use the formula:
a = (v-u)/t
Substituting the given values we get:
a = (72-36)/5
a = 7.2 m/s²

Retardation:

  • Initial velocity (u) = 72 km/hr

  • Final velocity (v) = 0 km/hr

  • Time (t) = 20 seconds


To find retardation (r) we can use the formula:
r = (v-u)/t
Substituting the given values we get:
r = (0-72)/20
r = -3.6 m/s² (negative sign indicates retardation or deceleration)

Explanation:
The problem involves finding acceleration and retardation of a car. Acceleration is the rate at which velocity changes over time, while retardation is the rate at which velocity decreases over time. In the given problem, the car speeds up from 36 km/hr to 72 km/hr in 5 seconds, which means it has an acceleration of 7.2 m/s². On the other hand, when the car stops in 20 seconds, its velocity decreases from 72 km/hr to 0 km/hr, indicating a retardation of -3.6 m/s². The negative sign indicates that the car is decelerating or slowing down. These calculations are important in understanding the motion of objects and can be used to solve various physics problems.
Community Answer
A car traveling at the 36km /hr speeds up to 72km/hr in 5 seconds. Wha...
A= v-u/t. [ 36 km/hr=10m/s and 72km/hr=20m/s].
= 10/20
=o.5m/s^2
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A car traveling at the 36km /hr speeds up to 72km/hr in 5 seconds. What it is acceleration if the same car stops in 20 seconds. What is the retardation Related: Numericals with Answers - Motion?
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