Question

A car is moving in the positive X direction at 20 metre / second and comes behind a truck and is unable to pass. The car slows down to 15 meter / second in time 2 seconds. Calculate car's average acceleration.​

Answer 1

Answer:

Initaial velocity= 20m/s

Final velocity= 15m/s

Initaial time= 0m/s

Final time = 2s

Average acceleration=?

we have to find average acceleration,

so, Average acceleration= ∆v/∆t

=Final velocity - Initial velocity/final time - initial time

=( 15 - 20 ) / ( 2 - 0 )

= -5/2 or -2.5 m/s

when an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration.

Explanation:

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