Question Number 105925 by ajfour last updated on 01/Aug/20
Commented by ajfour last updated on 02/Aug/20
$${Find}\:{u}_{{min}} \:{such}\:{that}\:{the}\:{solid}\:{ball} \\ $$$${can}\:{climb}\:{up}\:{the}\:{plank}.\:{Mass}\:{of} \\ $$$${ball}\:{m},\:{and}\:{that}\:{of}\:{plank}\:{is}\:{M}. \\ $$$$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \\ $$