Answer:
900
Explanation:
v = s / t = 9000m / 10 s = 900m/s
Answer:
θ = 90º
Explanation:
The velocity is given by
v =
calculate
v = 3 i ^ + √2 j ^ + 2t k ^
acceleration is defined by
a = dv / dt
a = 2 k ^
one way to find the angle is with the dot product
v. a = | v | | a | cos θ
cos θ= v.a / | v | | a |
Let's look for the value of each term
v. a = 4 t
| v | = =
| a | = 2
they ask us for the angle for time t = 0
v. a = 0
| v | = √11 = 3.317
we substitute
cos θ = 0 /√11
cos θ = 0
therefore the angles must be θ = 90º
Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force
Answer:
v = 11.2 m/s
Explanation:
A stone is dropped near the lunar surface and falls freely for 7 seconds. The acceleration of lunar gravity is 1.6 m / s², what speed will it reach?
Given that,
The acceleration due to the gravity of lunar gravity is 1.6 m/s²
A stone is dropped near the lunar surface and falls freely for 7 seconds.
We need to find the speed with which it reach.
The initial velocity of the stone will be 0 as it was at rest.
Using equation of kinematics v=u+at
So, the stone will reach with a speed of 11.2 m/s