can you answer this physics problems?

Question

1. can an automobile with a velocity toward north simultaneously accelerate toward the south?
2. can an object reverse its direction of travel while maintaining an constant acceleration? if so site examples if not explain why?
3. starting from rest one car accelerates to a speed of 50km./hr. and another car accelerates to a speed of 60 km./hr. can you say which car underwent greater acceleration? why?
4. Cite an example of something that undergoes acceleration while moving at constant speed. Can you also give an example of something that accelerates while traveling at constant velocity? explain
5. cite en example of something with a constant speed that has a varying velocity? cite also an example that has varying speed that has constant velocity. explain
6.can an object be moving with zero acceleration? cite example Can an object accelerate with a speed of zero?if so give example
7can you cite an example wherein the acceleration of the object is opposite in direction of its velocity?

Answer 1

1. Yes. It's called "braking".
2. Yes. Think about throwing a ball into the air.
3. The second car accelerated more, because its velocity changed more in the same amount of time, and acceleration = dv/dt.
4. Anything that moves in a circular path is accelerating while its speed stays constant. However, its velocity is always changing in direction. An object with a constant, unchanging velocity is, by definition, not accelerating.
5. An object traveling in a circular path has a constant speed, but a varying velocity. The velocity magnitude remains constant, but velocity is a vector, and the direction changes all the time.
6. An object traveling at constant velocity has zero acceleration. The exact instant you drop a ball, it has zero velocity, but it is accelerating.
7. A car hitting the brakes has a forward velocity, but a backward acceleration (which makes its speed decrease).

Answer 2

#1 Yes once it gos to far north #2 yes planets rotation #3 no how long did it take to reach the max acceleration #4 Gravity with unstable medium #5 same as #4 #6 Yes gravitation a full moon rising over a body of calm water #7 ? a pulley #8 two object traveling parallel at the same speed why do thy not act upon each other ?/ help me on that one