The magnitude of your displacement is usually less than the distance you travel.
The magnitude of your displacement can be equal to the distance you travel, if you travel in a perfectly straight line.
The magnitude of your displacement can never be greater than the distance you travel.
"watt" means "Joule of energy per second"
"60 watts" means "60 Joules per second"
(60 joules per second) x (5 seconds) = <em>300 Joules of energy</em>
Average force is 666.67 N
<u>Explanation:</u>
Given that :
m = Mass of the baseball = 0.2 kg
u = Initial velocity = 20 m/s
v = Final velocity = 40 m/s
t = Time taken for change in velocity = 0.006 s
We know:
Force exerted = mass × acceleration = m ×a
Acceleration can be found by means of dividing the change in velocity measured in m/s by the time taken in seconds.
a =
=
m/s²
Now we have to find the force using the formula, F = mass × acceleration as,
F = 0.2 kg ×3333.3 ms⁻² = 666.67 N
Given
m1(mass of the first object): 55 Kg
m2 (mass of the second object): 55 Kg
v1 (velocity of the first object): 4.5 m/s
v2 (velocity of the second object): ?
m3(mass of the object dropped): 2.5 Kg
The law of conservation of momentum states that when two bodies collide with each other, the momentum of the two bodies before the collision is equal to the momentum after the collision. This can be mathemetaically represented as below:
Pa= Pb
Where Pa is the momentum before collision and Pb is the momentum after collision.
Now applying this law for the above problem we get
Momentum before collision= momentum after collision.
Momentum before collision = (m1+m2) x v1 =(55+5)x 4.5 = 270 Kgm/s
Momentum after collision = (m1+m2+m3) x v2 =(55+5+2.5) x v2
Now we know that Momentum before collision= momentum after collision.
Hence we get
270 = 62.5 v2
v2 = 4.32 m/s