<u>Velocity = 27.2 m/s</u>
<u>Explanation:</u>
The velocity at the bottom of the first hill can be determined with the change in Kinetic energy. Due to energy conversion, both the change in kinetic energy and potential energy is same when the height is changed.
So, by applying the formulas:
KE = 
where KE is Kinetic energy, m is the mass and v is the Velocity.
PE = mgh
where PE is Potential energy, m is the mass, g is the gravitational force and h is the height.
Since, both the energies are equal, we can write:
PE = KE
= mgh
v² = 2gh
v = 
To Substitute:
h = 42 - 4.2 = 37.8 m
g = 9.8 m/s²
So, v = 
= 27.2 m/s
The correct answer for this question would be option A. When Barry is
conducting an experiment and rolls a tennis ball down a ramp, the
statement that best describes the motion of the tennis ball is that, i<span>t does not exhibit projectile motion and follows a straight path down the ramp. Hope this helps.</span>
Explanation:
Let omega = angular velocity (in rad/s). Then
omega = (# of oscillations)/(6 s)
= (30 osc)/(6 s) = 5 osc/s
We need to convert this to rad/s:
omega = (5 osc/s)(2π rad/osc)
= 10π rad/s
= 31.4 rad/s
I think it would have to be B.
If the net force acting on a moving object causes no change in its velocity, the object's momentum will stay the same.
<h3>What is momentum?</h3>
Momentum of a body in motion refers to the tendency of a body to maintain its inertial motion.
The momentum is the product of its mass and velocity.
This suggests that if the net force acting on a moving object causes no change in its velocity, the momentum of the object will remain the same.
Therefore, if the net force acting on a moving object causes no change in its velocity, the object's momentum will stay the same.
Learn more about momentum at: brainly.com/question/13554527
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