Physics

posted by .

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 -

    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

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. phys

    Sam is taking his girlfriend Sally out for a ride in his boat. He starts out at rest. He accelerates with an acceleration of 0.199 m/s^2 for 83.9 s. At that time Sally decides they are going fast enough and the boat moves at constant …
  2. Physics

    Sam is taking his girlfriend Sally out for a ride in his boat. He starts out at rest. He accelerates with an acceleration of 0.263 m/s^2 for 92.1 s. At that time Sally decides they are going fast enough and the boat moves at constant …
  3. PHYSICS

    Sally Sue, an enthusiastic physics student enjoyed the opportunity to collect data from standing waves in a spring. She and her partner help the ends of their spring 4.00 meters apart. There are 5 nodes in the standing wave produced. …
  4. Physics

    A boat is headed due east (0) at 20 km/hr. A wind blowing to the south west at 18 km/hr is also acting upon it. What is the boat's velocity?
  5. physics

    a man of 50kg is standing on one end on a boat of length 25m and mass 200 kg .if he starts running and when he reaches the other end ,he has a velocity 2m/s with respect to the boat .the final velocity of the boat is?
  6. physics

    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?
  7. Physics

    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?
  8. Physics

    A girl is skipping stones across a lake. One of the stones accidentally ricochets off a toy boat that is initially at rest in the water (see the drawing below). The 0.094-kg stone strikes the boat at a velocity of 14 m/s, 15° below …
  9. physics

    A girl is skipping stones across a lake. One of the stones accidentally ricochets off a toy boat that is initially at rest in the water (see the drawing below). The 0.058-kg stone strikes the boat at a velocity of 15 m/s, 15° below …
  10. physics

    A boat heads across an East-West river flowing at 3 m/s [W]. The boat starts at the South End and travels at 6 m/s [N25W]. What is the velocity (including direction) of the boat with respect to the ground?

More Similar Questions