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If the velocity and acceleration are in the same direction, then the object will
a. be speeding down
b. be speeding up
c. have no change in speed
d. be speeding up first and then slows down
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Ответ:
The speed of the book was 30 mph the moment after the crash.
Explanation:
Here we invoke Newton's 1st law which says that when no forces acting are on a body, it will not change its motion—if its a rest, it will remain at rest; if it is moving with constant velocity, it will keep moving with constant velocity.
Before the crash happened, both the car and the book are going at 30mph, After the crash, the car stopped, and since there was no frictional force on the book, Newton's 1st law demands that the book keeps going at the velocity it has; therefore, the book will continue moving at 30mph after the crash.