If the brakes are applied and the speed of the car is reduced to 12 m/s in 15 s , determine the constant deceleration of the car.

Given:

= 12 m/s

Time = 15 s

To find:

Deceleration = ?

Formula used:

Deceleration is given by,

a =

Solution:

Acceleration of the body is rate of increase of velocity. Deceleration of the body is negative acceleration i. e rate of decrease of velocity.

Thus, deceleration of the body is given by,

a =

where a is the deceleration of the body

v is the velocity

is rate of change of velocity

t is the time

a =

a = 0.8 m/

Thus, deceleration is 0.8 m/ .

layer a is the exosphere and layer b is the thermosphere.   is the answer i think but i hope this .

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

hope that !                                         : )