Posted by **Chad** on Monday, August 6, 2012 at 4:27pm.

A 125 kg flatbottomed boat is floating along at 5.0 m/s, headed east. Sally Sue, standing at one end of the boat, starts to walk at 2.0 m/s, also to the east. If Sally’s mass is 65 kg, what is the speed of the boat as she walks along?

- Physics -
**Ajayb**, Monday, August 6, 2012 at 4:50pm
Initial momentum of boat+Sally system is=(125+65)*5= 190*5=950 Kg m/s

Sally's speed is 2.0m/s relative to boat i.e. w.r.t.a stationary observer it is (2+V)m/s where V is the speed of the boat when Sally walks.

Since there is no external force acting on our system, the linear momentum shall be conserved. Hence,

950=125*V+65*(2+V)= 190*V+130

V= (950-130)/190 =820/190=4.3 m/s

## Answer this Question

## Related Questions

- Physics - A 125 kg flatbottomed boat is floating along at 5.0 m/s, headed east. ...
- physics - A 125 kg flatbottomed boat is floating along at 5.0 m/s, headed east. ...
- Physics - Sam is taking his girlfriend Sally out for a ride in his boat. He ...
- phys - Sam is taking his girlfriend Sally out for a ride in his boat. He starts ...
- Physics - A boat is headed due east (0) at 20 km/hr. A wind blowing to the south...
- physics - A boat heads across an East-West river flowing at 3 m/s [W]. The boat ...
- PHYSICS - Sally Sue, an enthusiastic physics student enjoyed the opportunity to ...
- physics - a man of 50kg is standing on one end on a boat of length 25m and mass ...
- physics - Sally and a partner holds the ends of a spring 4 meters apart. There ...
- business law - Contracts - Jeff wanted to sell his motor boat. He offered it to ...

More Related Questions