Influenced by the gravitational pull of a distant star, the velocity of an asteroid changes from from +19.9 km/s to −18.3 km/s over a period of 1.97 years.
(a) what is the total change in the asteroid's velocity? (indicate the direction with the sign of your answer.) m/s
(b) what is the asteroid's average acceleration during this interval? (indicate the direction with the sign of your answer.)

Given:

Initial velocity of the asteroid, v = 19.9 km/s = 19900 m/s

(since, 1km = 1000 m)

Final velocity of the asteroid, v' = - 18.3 km/s = -18300 m/s

time period, T = 1.97 years

Solution:

(a). Total change in velocity, :

= v' - v

= - 18300 - 19900 = - 38200 m

here, negative sign is indicative of the fact that the motion of the asteroid is in the downward direction.

(b) Asteroid's average acceleration, a:

a =

a =

a =

Here, the negative sign is the indication of deceleration of the asteroid in the downward direction.

a, c, d, e are all applying about success strategies.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.