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Julli [10]
3 years ago
10

Which if the following statements is true? A. Instantaneous acceleration is always changing. B. An object at rest has an instant

aneous acceleration of zero. C. An object that is accelerating is always changing direction. D. An object that is accelerating is always changing speed.
Physics
1 answer:
ycow [4]3 years ago
3 0
B is the right one

hope this helps you
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A racing car reaches a speed of 42 m/s. It then begins a uniform negative acceleration, using its parachute and braking system,
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As per the question the initial speed of the car [ u] is 42 m/s.

The car applied its brake and comes to rest after 5.5 second.

The final velocity [v] of the car will be zero.

From the equation of kinematics we know that

                                         v=u+at [ here a stands for acceleration]

                                         0=42 +5.5a

                                         a =\frac{-42}{5.5} m/s^2

                                          a= -7.64 m/s^2

Here a is taken negative as it the car is decelerating uniformly.

We are asked to calculate the stopping distance .

From equation of kinematics we know that

                                              S=ut+\frac{1}{2} at^2  [here S is the distance]

                                                      = 42*5.5 +\frac{1}{2} [-7.64] [5.5]^2 m

                                                       =115.445 m      [ans]  

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Answer:

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Explanation:

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