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December 19, 2014

Homework Help: Physics

Posted by Amy on Friday, January 4, 2008 at 9:21pm.

Can someone please check my answers for the first three questions and help me with the last one?

1)A racecar accelerates from rest at +7.2 m/s2 for 4.1 seconds. How fast will it be going at the end of that time?

Answer: 29.5 m/s

2)A racecar starts from rest and is accelerated uniformly to +41 m/s in 8.0 s. What will be the car's displacement?

Answer: 328 m

3)A rubber ball strikes a wall at a velocity of +35 km/hr and rebounds with a velocity of -15 km/hr. The change in velociy is:

Answer: +50 km/hr

I need some help with this last question...

A boat going 5 m/s eastward is crossing a river that flows southward at 1 m/s. Find the resultant velocity of the boat.

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