Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
Two Physical Science Questions?
1. if a car moving at 15 km/h skids 15 m with locked brakes how far will the car skid at 150 km/h
2. on slide a child has potential energy that decreases by 1000 J while her kinetic energy inreases by 900 J. What other form of energy is involved and how much
thanks so much i couldn't find these two answers in my book and i've done tons of questions but these two are killing me
2 Answers
- Anonymous1 decade agoFavorite Answer
1. WORK TO STOP CAR = KINETIC ENERGY OF CAR
FORCE X DISTANCE = .5MV^2
DISTANCE PROPORTIONAL TO V^2
15meters/dist = (5km/h/150km/h)^2
15m/d = 100
d= 1500m
2. 1000J potential energy - 900J kinetic energy = 100J
The 100J is lost to friction, which turns into heat energy.
- 1 decade ago
the second one is 100J of heat energy from friction of the butt on the slide. Her butt will be slightly warmer at the bottom than it was at the top
