I am gonna guess
1) 8m
2) total time
3) instantaneous acceleration
4) the train’s acceleration is negative
5) equal zero
6) acceleration due to gravity
Explanation:
1.
Initial speed of satellite is 30,000 m/s
Final speed of satellite is 15000 m/s
Time taken by the satellite to reach final speed is 60 s
The satellite’s acceleration is equal to the change in velocity divided by time taken. So,
2.
Initial speed of a boat is 42 m/s
Final speed of a boat is 88 m/s
Time taken is 4 s
The acceleration of boat during this period is :
For an atom to achieve a stable electron configuration, it needs 8 valence electrons. Since this atom has 6 valence electrons, it needs 2 more to achieve a stable electron configuration.
8-6=2
The atoms furthest from the nucleus
Wave speed = frequency * wavelength
Wave speed = 4 * 25
Wave speed = 100 m/s