Acheetah of mass 68 kg can accelerate from rest to a speed of 20.1 m/s in 2.0 s. assuming constant acceleration, what is the net force that causes this acceleration?
272 n
78 n
137 n
680 n

680 N

Explanation:

We start by calculating the cheetah's acceleration knowing that goes from rest (0 speed) to 20.1 m/s in 2 seconds:

Now we use the definition of force (F):

Therefore the force that accelerates the cheetah is 683.4 Newtons which we can round to 680 N to match the fourth choice shown

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.