Question

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Answer 1

Answer:

friction is got by mgu

mg is 400

so 400×0.4 is friction.

f=160

but the upward force is acting so it is (400+3/5)0.4

force horizontal is 4/5f

therefore equate

4/5f=(400+3/5f)4/10

2f=400+3/5f

f~~=290