Answer: See explanation
Explanation:
The reason why astronomers think that the rates of impact for the Moon must have been higher earlier than 3.8 billion years ago is because on the older highlands, there are ten times more craters than on the younger maria.
It is believed that the impact rate was higher earlier and thus can be seen when the numbers of the craters that can be seen on the lunar highlands is being compared to that on the maria. It should be noted that there are about 10 times more craters that can be found on the highlands than those on the maria.
If there was a constant rate of impact throughout the history of the Moon, then the highlands be about 10 times older and therefore will have been formed about 38 billion years ago.
Answer:
a) Her average speed was 0.778 km/min
b) Her average velocity was 0.572 km/min
Explanation:
a) The average speed is given by the traveled distance over time:
average speed = distance / time
average speed = 14.0 km / 18.0 min = 0.778 km/min
b) The average velocity is given by the displacement over time. It is calculated as the variation of the position over time relative to the frame of reference. In this case, the origin of the frame of reference is located at the home of the student. The final position will be the university. Then:
velocity = (final position - initial position)/ time
velocity = 10.3 km / 18.0 min = 0.572 km/min
Resultant momentum is 60,000kgm/s
60,000 = mass of cart and truck x velocity of car and truck
60,000= 5600 x V
V= 10.71428571 m/s
