When you know both the speed and direction of an object’s motion, you know the velocity of an object. speed in a given direction is called velocity
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Answer:
C) The acceleration is downward during the entire time the ball is in the air.
Explanation:
If we neglect air resistance, there is only one force acting on the ball, which is the force of gravity.
The magnitude of the force of gravity is
F = mg
where m is the mass of the ball and g is the acceleration of gravity. According to Newton's second law, therefore the acceleration of the ball during the entire motion is
So, it is equal to the acceleration of gravity () and in the same direction (downward). Since this force is constant, then the acceleration is the same during the entire motion, therefore the correct answer is
C) The acceleration is downward during the entire time the ball is in the air.
Answer:
Explanation:
a ) Let angle of incidence and angle of refraction be i and r respectively .
submarine is 300 m away from the shore . The point where laser strikes the surface of sea is 90 m horizontally away .
Tan r = 90 / 120
= 3 / 4
.75
r = 37 degree
c ) sini / sin37 = 1.333
sini = .8
i = 53 degree
Tan 53 = 210 / h , h is height of the building .
h = 210 / tan 53
= 158 m
Heat is how hot something is, temperature is how hot or cold something is.