posted by Adam .
an adult 68 kg cheetah can accelerate from rest to 20.1 m/s (45 mph) in 2.0 s. Assuming constant acceleration, (a) find the net external force causing this acceleration. (b) where does the force come from? that is, what exerts the force on the cheetah?
Doesn't the ground exert force on the cheta?
i don't get the first equation explain more please
should i be using the equation you wrote for finding the net EXTERNAL force??
Yes. That is the force accelerating the cheeta.
i got 1366.8 N and i'm asked to round to SF would it be 1.3*10^2?
a= 20.1m/s /2= 10.05m/s^2
How did you get that number 1366?
Now, rounding 1366.8 is not 1/3E2
E2 is 100. But you have other errors that need to be corrected.
i corrected it and i got 683.4 N, does that sounds right? if yes, would it be 6.8E-1?