Question

Tim is riding a bike at a velocity of 10 m/s north. As he starts to climb a hill, his velocity decreases to 5 m/s north. Is the acceleration positive or negative? Calculate the acceleration if it takes 2 seconds for Tim's velocity to change.

Answer 1

Answer:

acceleration is positive

Answer 2

Answer:

Explanation:

Tim is riding a bike at a velocity of 10 m/s north. As he starts to climb a hill, his velocity decreases to 5 m/s north. Is the acceleration positive or negative?

The acceleration is negative and is known as Deceleration or retardation.

Given:

Initial velocity:10 m/s,

Final velocity:5 m/s,

time taken:4 seconds.

To find:

Retardation(negative),

Retardation=initial velocity-final veleocity/time taken,

R=u-v/t,

R=10-5/2,

R=5/2,

R=2.5,

So negative acceleration or retardation=2.5 m/s².

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