Answer:
Joule (J)
Explanation:
Joule (J) is the SI unit of heat energy (any energy - thermal, electrical, mechanical..). It is named after the English physicist James Prescott Joule.
Answer:
2000 kg m/s
Explanation:
The momentum of an object is a vector quantity whose magnitude is given by
where
m is the mass of the object
v is the velocity of the object
and its direction is the same as the velocity.
In this problem, we have:
- Spaceship 1 has
m = 200 kg (mass)
v = 0 m/s (zero velocity)
So its momentum is
- Spaceship 2 has
m = 200 kg (mass)
v = 10 m/s (velocity)
So its momentum is
Therefore, the combined momentum of the two spaceships is
To help you out I'll give you the equations a) s=d ÷t
b) a=vf-vi ÷ t
15km = 15,000m
1/2h = 1800s
15,000 / 1,800 = 25/3ms^-1
The answer is option C .Because as the direction of the boy changes ;velocity changes .