Answer:4500 N
Explanation:
Given
mass of truck 
mass of car
as the car push the ground with a force of 4500 N so the force on the truck should also be 4500 N as they all the force is transmitted to push the truck
and their acceleration is

Answer:
200 newtons
Explanation:
because the sub air that would pull the force down by all of the mass of the sub air go down by that 400 newtons there for your anwer is 200 newtons. because 600-400=200
with a -1 iron charge it becomes an electrode
Speed = distance/time
Time = 90/60 = 1.5 hours
Speed = 54/1.5
Speed = 36km/h
Explanation:
h=mc∆¶
where ∆¶ means change in temperature
h=8×820×(50-15)
=8×820×35
=229600j
=229.6kj