It would be the first one and the third one
Answer:
Yes
Explanation:
A neutral atom has equal no. of protons and electrons.
Answer:
e. The impulse exerted by the floor
Explanation:
a. The momentum just before colliding with the floor.
will be identical because they have the same mass and are falling the same distance so will have the same velocity. p = mΔv, v = √(2gh)
b. The amount of time in contact with the floor.
a component of impulse, but not the entire story. Ball B could have a longer contact time, but a smaller average force. p = FΔt
c. The kinetic energy just before colliding with the floor.
will be identical because they have the same mass and are falling the same distance so will have the same velocity. KE = ½mv², v = √(2gh)
d. The average force exerted by the floor
a component of impulse, but not the entire story. ball B could have a larger average force but a shorter period of action. p = FΔt
-- While gaining 2.15 m/s more speed every second, the van
would gain (2.15 x 7) = 15.05 m/s more speed in 7 seconds.
-- We're told that its speed at the end of the 7 seconds
is 20 m/s .
-- So its speed at the beginning of the 7 seconds must have been
(20 m/s - 15.05 m/s) = 4.95 m/s .
What is a projectile give example?
The motion of such a particle is called Projectile Motion. In the above diagram, where a particle is projected at an angle θ, with an initial velocity u.
...
Few Examples of Two – Dimensional Projectiles.