# Find the speed of the box moving up the plane 3 sec later.

#### Bama

There are 2 question but the 2nd question solution is derive from the 1st question.

1. A box is sliding down a plane inclined at an angle of 20 degrees from the horizontal. Find the acceleration of the box, neglecting friction and air resistance.

2. A box that is hurled up the inclined plane starts up the plane with an initial velocity of 1000 cm/sec. Find the speed of the box moving up the plane 3 sec later.

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#### Nylex

Is this homework? Firstly, this is in the wrong place. Secondly, if you want help you need to show some effort. People aren't gonna do your work for you.

#### darkar

I would suggest u draw the vector diagram if u r confused with the question.

#### Dr.Brain

1) Draw the free body diagram of the box. Take components of forces along the slope , the forces in downward direction - the forces up the slop = ma , calculate 'a'

2)Usie Kinematics equations .

BJ

#### mathmike

you can do it this way

Fx = mgsin@ = MAx

Fy = n - mgcos@ = 0

Ax = g sin@

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