A 1000kg car travels north with a speed of 30m/s. A 2000kg truck is traveling south with a speed of 20m/s. Taking north as the positive velocity direction, the total momentum of these two vehicles is

(A) 30,000kgm/s. (B) -40,000kgm/s.
(C) 70,000kgm/s. (D) 10,000kgm/s.
(E) -10,000kgm/s.

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A 1000kg car travels north with a speed of 30m/s. A 2000kg truck is traveling south with a speed of 20m/s. Taking north as the positive velocity direction, the total momentum of these two vehicles is

(A) 30,000kg m/s. --- No.

(1000kg)(30m/s) - (2000kg)(20m/s)

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A 1000kg car travels north with a speed of 30m/s. A 2000kg truck is traveling south with a speed of 20m/s. Taking north as the positive velocity direction, the total momentum of these two vehicles is

(B) -40,000kgm/s. --- No.

(1000kg)(30m/s) - (2000kg)(20m/s)

Try again.
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A 1000kg car travels north with a speed of 30m/s. A 2000kg truck is traveling south with a speed of 20m/s. Taking north as the positive velocity direction, the total momentum of these two vehicles is

(C) 70,000kgm/s. --- No.

(1000kg)(30m/s) - (2000kg)(20m/s)

Try again.
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A 1000kg car travels north with a speed of 30m/s. A 2000kg truck is traveling south with a speed of 20m/s. Taking north as the positive velocity direction, the total momentum of these two vehicles is

(D) 10,000kgm/s. --- No.

(1000kg)(30m/s) - (2000kg)(20m/s)

Try again.
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A 1000 kg car travels north with a speed of 30 m/s. A 2000 kg truck is traveling south with a speed of 20m/s. Taking north as the positive velocity direction, the total momentum of these two vehicles is

(E) -10,000kgm/s. --- Yes.
(1000kg)(30m/s) - (2000kg)(20m/s)
= (30,000 - 40,000)kgm/s

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