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MMLU / It is known that a lab cart is moving east at 25 cm/s at time t1 = 0.10 s, and…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

It is known that a lab cart is moving east at 25 cm/s at time t1 = 0.10 s, and then moving east at 15 cm/s at t2 = 0.20 s. Is this enough information to determine the direction of the net force acting on the cart between t1 and t2?

choices

  1. Yes, since we know the cart is slowing down, its momentum change is opposite the direction of movement, and the net force is in the direction of momentum change.
  2. No, because we don’t know whether forces such as friction or air resistance might be acting on the cart.
  3. No, because we don’t know the mass of the cart.
  4. Yes, since we know the cart keeps moving to the east, the net force must be in the direction of motion.

subject

high_school_physics

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Source and history

task_id
2c37d66a-ed56-59b8-9bbc-e99f5e403986
task_key
all--test--2c37d66a-ed56-59b8-9bbc-e99f5e403986
task_revision_id
1
config / split
all / test

Official source

initial import