How can I resolve this?

[Rik]

Can you copy the code instead of an image?

[Chandhrikka Ravi]

syms x(t) m g l e a

>> Dx = diff(x);

>> simplify(dsolve(m*diff(x,2) == -m*g*(x-l)/e, t(0) == 0, x(0) == a, Dx(0) == 0))

Answer 1

[Birdman]

Following code solves the problem. The command t(0)==0 does not make any sense since t is independent variable. Also, you used dsolve command incorrectly. See the following code:

syms x(t) m g l e a
Dx=diff(x,t);
x(t)=dsolve(m*diff(x,2) == -m*g*(x-l)/e,[x(0) == a, Dx(0) == 0])

Then, you can verify the solution according to the initial conditions. It is verified.

[Chandhrikka Ravi]

Thank you!!