Question

doubt

Answer 1

a block of mass 10 kg is moving horizontally with a speed of 1.5 m/s on a smooth plane of a constant vertical force 10N acts on it. the displacement of the block from the point of application of force at the end of 4s is ?

Answer 2

@Mashy @Vincent-Lyon.Fr

Answer 3

The block is moving horizontally at constant speed

The force is vertical - so does not affect the speed

The plane is smooth so the vertical force does not affect friction

I'm not sure I see what the question is after....

Answer 4

Same here. The correct answer is 18. I do not know how to get to it.

Answer 5

Sorry its 10 not 18.

Answer 6

"smooth plane of a constant vertical force 10N acts on it"

Can you check the question? - that looks like an error in the sentence...

Answer 7

This is the same qn:

http://www.meritnation.com/ask-answer/question/a-block-of-mass-10-kg-is-moving-horizontally-with-a-speed/physics/4382084

Answer 8

Sorry - the question doesn't make sense to me

(And the answer given on the other site is clearly incorrect)

Answer 9

Yeah. :/

Answer 10

Thanks for trying!

Answer 11

Yea.. that question makes no sense

displacement after 4 seconds must be 4 x 1.5 = 6m!
thats the only sane answer :P
the force doesn't affect the block!

Answer 12

Same is what I was thinking. Thanks :)

Answer 13

The wording of the problem is terrible!

What I understand is this:

Horizontal velocity is 1.5m/s
Upward force on PLANE (holding mass) is 10 N => vert acc is 1m/s²

Horizontal displacement : 1.5 x 4 = 6 m
Vertical displacement = at²/2 = 8 m

Total displacement = root (6² + 8²) = 10 m

Answer 14

that is not possible if there is gravity @Vincent-Lyon.Fr :D :D!!

Answer 15

You're right. This problem is definitely stupid. ;-)