The upward force exerted on the board by the support is mathematically given as
Fu= 764.8 N
What is the upward force exerted on the board by the support?
Generally, the equation for is  mathematically given as
Considering that the Net Force on the system is null
The weight of the children plus the weight of the board equals the upward force imposed on the support.
The upward force
Fu= 440 + 272 + 52.8 N
Fu= 764.8 N
In conclusion, he upward force exerted on the board by the support
Fu= 764.8 N
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