Answer:
He sees the ball coming at him at 150 km/hr.
Explanation:
In Newtonian physics, the observer would say that the velocity of the first object is the sum of the two velocities.
Due to the same direction, both velocities will be added.
Answer: D. 0.29 m
Explanation:
We will use the following equations to describe the leap of the cat:
(1)
(2)
Where:
is the height of the cat
is the cat's initial velocity

is the acceleration due gravity
is the time
is the y-component of the velocity
Now the cat will have its maximum height
when
. So equation (2) is rewritten as:
(3)
Finding
:
(4)
(5)
(6)
Substituting (6) in (1):
(7)
Finally:
(8)
C the thermal equilibrium
Answer:
(A) Time period T = 6.28 SEC
(B) At highest point fore is - 575.83 N
(B) At lowest point force is 1050.97 N
Explanation:
We have given that mass m = 83 kg
Radius r = 13 m
Speed v = 6.10 m/sec
(A) Time period of the motion is given by 
(b) Net force is given by 
Force due to gravity 
At highest point 
(B) At lowest point 
A as the particles became cooler they lost energy and moved less resulting in less pressure on the balloon