Answer:
(B)Speed - constant, Velocity - changing
Explanation:
The magnitude of the velocity ( speed ) has not changed as car is traveling constantly at 70 km/h. But we know the velocity is also having a direction component, and the car which was traveling South is now traveling East. As direction is changed, velocity is changed but as magnitude of velocity has not changed, the speed remain unchanged.
Answer:
Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward one another. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides.
Magnitude of acceleration = (change in speed) / (time for the change) .
Change in speed = (end speed) - (start speed)
= (2 m/a) - (8 m/a) = -6 m/a .
Time for the change = (end time) - (start time)
= (13 sec) - (10 sec) = 3 sec .
Magnitude of acceleration = (-6 m/a) / (3 sec)
= -2 m/a per second .
(That's the best I can do with the ambiguous units.
What unit of speed is 'm/a' ? Is that "miles per afternoon" ?)
Answer:
It looks like A is the correct answer.
