Homework Help: physics

Posted by aisha 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 - drwls, 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 - Anonymous, Friday, May 11, 2012 at 7:34am
plzzz explain how to draw root 5 on a number line

Answer this Question

Related Questions

please help me - A ball starts from rest and rolls down a hill with uniform ...
Physics 1 - A ball starts from rest and rolls down a hill with uniform ...
Physics - A 0.525 ball starts from rest and rolls down a hill with uniform ...
Physics - A 0.525 kg ball starts from rest and rolls down a hill with uniform ...
Physics - A ball rolls down a hill with a constant acceleration of 2.0 m/s2. If ...
Physics - A ball rolls down a hill with a constant acceleration of 2.0 m/s2. If ...
PHYSICS - An 800.0 kg roller coaster car is at rest at the top of a 95 m hill. ...
physics - 4. An 800.0 kg roller coaster car is at rest at the top of a 95 m hill...
Physics-1 - A child sleds down a snow covered hill with a uniform acceleration. ...
physics - The cart starts from rest at the top of a hill with height, H2. It ...

For Further Reading

First Name:
School Subject:
Answer: