What average force is necessary to bring a 50.2-kg sled from rest to a speed of 2.8 m/s in a period of 20.1 s?

To solve this problem we will use the concepts related to the Impulse-Momentum Theorem for which it is specified as the product between force and change in time

And

\Delta p = m\Delta v

Where,

Rearranging to find the Force we have that

Using the expression between mass and velocity

Our values are given as,

Then replacing we have that

Therefore the average force is 6.99N

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.