Question Details

An explicit forward Euler method is used to numerically integrate the differential equation 

using a time step of 0.1. With the initial condition y(0) = 1 , the value of y(1) computed by this method is ___________ (correct to two decimal places).

Show Answer

Correct Answer :

2.59

Solution :

The correct answer is 2.59.

Step-by-Step Explanation:

We are given the ordinary differential equation:
d y d t = y
with the initial condition y(0)=1 and a time step of h=0.1.

The explicit forward Euler method is defined by the iteration formula:
y n + 1 = y n + h f ( t n , y n )
where f(t,y)=y in this case.

Substituting the given function and step size into the formula, we obtain:
y n + 1 = y n + 0.1 y n = 1.1 y n

We want to find the value of y(1). The number of steps N required to go from t=0 to t=1 with h=0.1 is:
N = 1 - 0 0.1 = 10

Therefore, after 10 iterations, the numerical solution is:
y 10 = ( 1.1 ) 10 y 0

Given the initial condition y0=y(0)=1, we calculate:
y 10 = ( 1.1 ) 10 × 1 2.5937

Rounding to two decimal places, we get:
y ( 1 ) 2.59

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