Calculat the sideral period of mars given its synodic period is 780 days. 7. calculate the synodic period of venus given its sidereal period is 229 days.

686 days for sideral period of Mars.

615 days for synodic period of Venus.

Explanation:

The equations we need to use is:

Where P is the sidereal period, S the synodic period and E the Earth's period (365 days) and where the + is used for inferior planes (Venus) and the - for superior ones (Mars).

For the sidereal period of Mars we then have:

And for the synodic period of Venus we then have:

(Commonly for Venus a sidereal period of 225 days is given, which changes this result to 587 days).

1.5 m/s2

Explanation:

U = 0 m/s ( from rest)

t = 20 s

S = 300 m

S = ut + 1/2 * a * t2

300 = 0 + 1/2 * a * 20*20

a = 1.5m /s2