<h2>About 1 billion trillion stars</h2>
Since the universe is so big, we don't know for sure what the exact number is, but assuming an average of 100 billion stars per galaxy (which is smaller than a universe), we could say that there are 1 billion trillion stars in the observable universe.
Answer:
The two forces are equal and opposite at all the times the ball.
Explanation:
A tennis player hits the ball with her racket. The force exerted by the racket on the ball to that exerted by the ball on the racket during the collision exert equal force all the times. It is due to Newton's third law of motion. It states that the force acting from object 1 to object 2 is equal to the force acting on object 2 to object A but the force is in opposite direction.
Hence, the correct option is (D).
Explanation:
answer 689910
M x G x H
mass = 77
G= 9.8
Meter = 915 this is the height
77 x 9.8= 754.6
754.6 X 915 = 689910 J
