Great Job!
Ms. Acosta
Wednesday, March 12, 2014
Monday, January 20, 2014
Tuesday, January 14, 2014
Monday, December 9, 2013
9th Grade HW
1) A car advertisement states that a certain car can accelerate from rest to 70 km/h in 7 seconds. Find the car’s
average acceleration.
2) A lizard accelerates from 2 m/s to 10 m/s in 4 seconds. What is the lizard’s average acceleration?
3) A runner covers the last straight stretch of a race in 4 s. During that time, he speeds up from 5 m/s to 9 m/s.
What is the runner’s acceleration in this part of the race?
4) You are traveling in a car that is moving at a velocity of 20 m/s. Suddenly, a car 10 meters in front of you slams
on it’s brakes. At that moment, you also slam on your brakes and slow to 5 m/s. Calculate the acceleration if it
took 2 seconds to slow your car down.
Wednesday, December 4, 2013
9th Grade HW
4.A train moving at a velocity of 15 m/s is accelerated to 24 m/s over a 12 second
period.
5. A plane starting from rest is accelerated to its takeoff velocity of 75 m/s during a 5 second period.
6. A ball rolling down a hill for 9 seconds accelerates from 3 m/s to 34.5 m/s
Thursday, November 28, 2013
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