The velocity of the package just before it hits the ground is 16.7 m/s.
The change of distance with respect to time is defined as speed. Speed is a scalar quantity. It is a time-based component. Its unit is m/sec.
Initial velocity(u)=2 m/s
V(velocity of hitting)=?
S(distance travelled)= 14 meters
The velocity of the package just before it hits the ground is found as;
From the Newton's third equation of motion;
v²=u²+2as.
v²=(-2)²+2(9.81)(14)
v=16.7 m/s
Hence,the velocity of the package just before it hits the ground is 16.7 m/s.
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B. Direct current always moves from the positively charged terminal to the negatively charged terminal.
C. Alternating current always moves from the positively charged terminal to the negatively charged terminal.
D. The flow of an alternating current switches direction when a generator's terminals change its charge.
Answer: D. The flow of an alternating current switches direction when a generator's terminals change its charge.
Explanation: I JUST TOOK THE PF EXAM AND GOT IT CORRECT!!!
Answer:
Asymptotic-giant-branch stars have helium-burning shells inside the hydrogen-burning shells, whereas red-giant-branch stars have hydrogen-burning shells only. In either case, the accelerated fusion in the hydrogen-containing layer immediately over the core causes the star to expand.
B. giant, main sequence star, white dwarf, neutron star
C. white dwarf, neutron star, giant, main sequence star
D. neutron star, white dwarf, main sequence star, giant
The following lists ofstars in order from least density to greatest density are giant, main sequencestar, white dwarf, neutron star. The answer is letter B. Aside from neutronstar being the densest star, it is also the smallest star compared to the giantstar, as its name implied.
Answer:
B
Explanation:
as a medium star
The gravitational potential energy of an object Is always measured relative to the height of the object. It has the equation equal to mass PE = mgh where PE is the potential energy, m is the mass of the object, H is the height of the object and g is the acceleration due to gravity.
The gravitational potential of an object is always measured relative to reference level/another point
Energy is the ability to do work. Energy can change from one energy to another
Gravitational potential energy is the energy that an object has because of its position
The potential energy can be formulated:
Ep = m. g. h
E = potential energy of an object, joule
m = object mass, kg
g = gravity acceleration, m / s2
h = height of an object, m
The higher the object from the surface of the earth and the greater the mass, the greater the potential energy of the object. Earth's gravity also affects the potential energy of objects
Potential energy itself includes mechanical energy
Em = Ek + Ep
Em = mechanical energy
Ek = kinetic energy
Ep = potential energy
The amount of kinetic energy and potential energy of objects is always constant
Determine how potential and kinetic energy changes at each position of the pendulum
Determine the mechanical energy
the potential of an object when it falls from a height
the gravitational potential energy between moon and earth
Keywords: the potential energy, kinetic energy, mechanical energy
Answer:
The John 's speed is 20 m/s.
The Betty's speed is 20 m/s
Explanation:
Given that,
John is traveling north at 20 meters/second and his friend Betty is traveling south at 20 meters/second.
We need to calculate the John and Betty's speeds
We know that,
The speed is a scalar quantity. its has only magnitude.
Hence, The John 's speed is 20 m/s.
The Betty's speed is 20 m/s