Concept explainers
(a)
To show: Speed of the car before reaching the groundis
(a)
Explanation of Solution
Given:
Car is moving vertically downwards
Formula used:
Kinetic energy =
Potential energy = mgH
Calculation:
Consider Car is moving vertically downwards having mass m , g is acceleration due to gravity, h is the height from which the car is falling down.
Hence the kinetic energy is to be equal to the potential energy,
Conclusion:
Therefore, speed of the car just before hitting the ground is
(b)
Height corresponding to a collision at a given speed.
(b)
Answer to Problem 61GP
Height associate to the speed 60 Km/hr. is 14.16 meters
Explanation of Solution
Given:
Speed of the car just before hitting the ground is 60 km/hr
Formula used:
The relation between velocity and height is
Calculation:
Convert the speed.
60 km/hr=
Substituting the values,
Conclusion:
Height associate to the speed 60 km/hr is 14.16 meters
(c)
Height associated at the given speed.
(c)
Answer to Problem 61GP
Height associated to the speed 100 km/hr. is 39.3 meters
Explanation of Solution
Given:
Speed of the car just before hitting the ground is 100 km/hr
Formula used:
The relation between velocity and height is
Calculation:
Convert the speed.
100 km/hr=
Substituting the values.
Conclusion:
Therefore, height associated to the speed 100 km/hr is 39.3 meters
Chapter 2 Solutions
Physics: Principles with Applications
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