physics
posted by Nina .
a child is sliding on a sled at 1.5m/s to the right. You stop the sled by pushing on it for 0.50 s in a direction opposite to its motion. If the mass of the child and the sled is 35kg. what average force do need to apply to stop the sled. Use the concepts of impulse and motion

force*time= mass*changeinvelocity

Every single the I attempt solving this problem and every different equation I use and could ever think of using I get an answer of 105 N and yet for some reason beyond my comprehension the book gives an answer of 110N

you're not following the sig fig rule it's 110 because you can only have 2 significant figures.

Zero isn't a significant number. Only if it was between the ones would it be considered a significant number.