Thursday
March 23, 2017

Post a New Question

Posted by on Monday, March 5, 2012 at 3:53pm.

A ball starts from rest and rolls down a hill with uniform acceleration, traveling 170 m during the second 5.5 s of its motion.


How far did it roll during the first 5.5 s of motion?
Express your answer using two significant figures.

x= m

  • physics - , Monday, March 5, 2012 at 6:12pm

    Speed at middle of second 5.5 s interval = 3 x (Speed at middle of first 5.5 s interval) = 170/5.5 = 30.91 m/s
    = (average speed during that interval)

    Speed at 8.25 s = 3 x speed at 2.75 s.
    Therefore:
    speed at 2.75 s = (1/3)*30.91 = 10.30 m/s
    Distance travelled during first interval 10.30 x 5.5 = 56.65 m
    Rounding that two 2 significant figures gives 57 m.

  • maths - , Friday, May 11, 2012 at 7:34am

    plzzz explain how to draw root 5 on a number line

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question