Answer:
10.5min
Explanation:
Given parameters:
Distance = 4200m
Speed = 400m/min
Unknown:
Time taken for this run = ?
Solution:
Speed is the distance divided by the time taken.
Speed = 
Time = 
Now insert the parameters and solve;
Time = 
= 10.5min
G=mg
649=10m
m=64,9kg
if we consider the gravitational acceleration 10m/s^2
The answer is frame of reference ( system ).
Frame of reference <span>is a physical concept related to state of motion.
hoped it helped!!</span>
Answer:
if I'm not wrong it
Explanation:
should be 2.7 m/s don't trust me though
