Physics

Problem

20\,\text{kg}

suitcase is on a weighing machine inside a lift that starts from rest and attains an upward acceleration that increases uniformly from

0

6\,\text{m\,s}^{-2}

3\,\text{s}

. What average reading (in newton) does the machine show during this

3\,\text{s}

interval? (Use

g = 9.8\,\text{m\,s}^{-2}

.) a)

236\,\text{N}

256\,\text{N}

196\,\text{N}

316\,\text{N}