- #1
Suraj M
Gold Member
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- 39
Homework Statement
The figure has 2 blocks, each 320 g connected by a light string. The horizontal surface is smooth. The block A is attached to a spring of spring constant 40 N/m whose other end is fixed 40cm above the horizontal. Initially the spring is vertical and unstretched.
Homework Equations
E= ½kx²
+basic
The Attempt at a Solution
I considered the point where the block leaves the surface.
so $$kx \sin(\theta) =mg$$
taking ##\sin(\theta) = \frac{0.4}{0.4+ x} ##
i get x = 0.1 cm so from that i get s = 0.3 cm
also acceleration of block A is given by
$$a=\frac{ M_B g}{M_A+M_B}$$
so i get ## v = sqrt{2as}##
v = √3
what I'm concerned is the spring has a component of force along the horizontal, but its variable, but also it effects the velocity, the given answer is 1.5 m/s.how do i consider the horizontal component?