(a) In outer space, far from other objects, block 1 of mass 40 kg is at position < 11, 6, 0 > m, and block 2 of mass 1350 kg is at position < 21, 6, 0 > m. What is the (vector) gravitational force acting on block 2 due to block 1? It helps to make a sketch of the situation.

grav= 1

. N

(b) At 4.2 seconds after noon both blocks were at rest at the positions given above. At 4.4 seconds after noon, what is the (vector) momentum of block 2?

2= 2

kg · m/s

(c) At 4.4 seconds after noon, what is the (vector) momentum of block 1?

1= 3

kg · m/s

At 4.4 seconds after noon, which one of the following statements is true?

Block 2 is moving faster than block 1.

Block 1 and block 2 have the same speed.

Block 1 is moving faster than block 2.

Though the force clearly changes as the object move, what simplifying assumptions can we make that make the problem manageable? What does Newton's Third Law relate?

grav= 1

. N

(b) At 4.2 seconds after noon both blocks were at rest at the positions given above. At 4.4 seconds after noon, what is the (vector) momentum of block 2?

2= 2

kg · m/s

(c) At 4.4 seconds after noon, what is the (vector) momentum of block 1?

1= 3

kg · m/s

At 4.4 seconds after noon, which one of the following statements is true?

Block 2 is moving faster than block 1.

Block 1 and block 2 have the same speed.

Block 1 is moving faster than block 2.

Though the force clearly changes as the object move, what simplifying assumptions can we make that make the problem manageable? What does Newton's Third Law relate?

## This question was asked on Jan 24, 2013.

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