1.8461 km/hr Well i need more characters so i might as well type a beautiful sentence for you to read and waste your time on.
Net Force = mass x acceleration
3500=1,000a
So a= 3500/1000
a=35/10
a=3.5 m/s^2
Sound waves....................................
Answer:

Explanation:
We are given that
Gravitational force=
r=0,U(0)=0
We know that
Gravitational potential energy=


Substitute r=0 ,U(0)=0


Substitute the value

It's actually Friction.
I just did the test and got it right.