First slide

Simple hormonic motion

Question

A spring of spring constant 5 × 10³ N/m is stretched initially by 5 cm from the unstretched position. Then the work required to stretch it further by 5 cm is

Easy

A

12.50 Nm
B

18.75 Nm
C

25.00 Nm
D

6.25 Nm

Solution

$\large U\, = \,\frac{1}{2}k{x^2}$
and W = Uf - Ui

= 18.75 N-m

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