Explanation:
it has no energy when considered with respect to earth ,as it has neither height (i e potential energy) nor velocity (i.e kinetic energy).
Answer:
v = 31.3 m / s
Explanation:
The law of the conservation of stable energy that if there are no frictional forces mechanical energy is conserved throughout the point.
Let's look for mechanical energy at two points, the highest where the body is at rest and the lowest where at the bottom of the plane
Highest point
Em₀ = U = m g y
Lowest point
= K = ½ m v²
As there is no friction, mechanical energy is conserved
Em₀ =
m g y = ½ m v²
v = √ 2 g y
Where we can use trigonometry to find and
sin 30 = y / L
y = L sin 30
Let's replace
v = RA (2 g L sin 30)
Let's calculate
v = RA (2 9.8 100.0 sin30)
v = 31.3 m / s
Answer:
a) 19.1s
b) 599.4m
c) 62.8 m/s
Explanation:
Suppose both the officer and your good friend start at the same position (the intersection point). The equation of motion for each of them are:
- Your friend:
- The Officer:
(a) In order for the officer to catch him, they should both end up in the same position at the same time (other than t = 0)
(b) Within 19.1 s, the officer would have travelled a distance of
(c) His speed when he catches up would be
Welll, yes, but only for an instant. A rock or baseball tossed straight up is accelerated by gravity, and when it reaches the very peak and starts to fall, it's velocity is zero at that instant.