Question

Which of the following case represents retardation?

a) boy running with uniform velocity b) ball is thrown vertically upward

c) bus starting from rest d) stone dropped down from a tower​

Answer 1

Answer:

I think option d is the right answer.

Explanation:

PLEASE MARK AS BRAINLIEST IF IT IS.

Answer 2

Answer:

The correct answer is b) ball thrown vertically upward.

Explanation:

• Retardation is defined as negative acceleration, i.e, rate of decrease of velocity per second.
• When a ball is thrown vertically upward, it is pulled in the opposite direction by the force of gravity.
• This causes it to experience a negative acceleration and lose its velocity at a uniform rate.
• A boy running with uniform velocity experiences no net change in his velocity and hence zero acceleration.
• A bus starting from rest experiences an increase in velocity, hence positive acceleration.
• A stone dropped from a tower experiences positive acceleration due to the force of gravity pulling it.

Hence, among these options, the only example of retardation or negative acceleration is b) a ball thrown vertically upward.