I have got Plus for this :/ A crate of mass 100 kg is being pushed in a straight line
across a horizontal floor at a constant speed of 4.0 m/s.
The coefficient of kinetic friction between the crate and
the floor is 0.3. Find the net force on the crate.

0 N
300 N
400 N
1200 N

Cigarette manufacturers purposefully add to cigarettes in order to give them a particular flavor. a. cocaine b. carcinogens c. cigarette ashes d. a and b

4. when a child cries out during rough play, the caregiver should a. encourage the distressed child to fight back. b. respond immediately, since the behavior has changed to fighting. c. ignore it, because rough play is a natural part of children’s learning. d. ignore the request for unless there has been an injury. i need answer

Which of these is a disadvantage of hydrogen fuel cells? a. engines that use hydrogen fuel are more efficient than gasoline-powered engines. b. the only emission produced by hydrogen fuel cells is water. c. hydrogen fuel is continually available and useful for heating. d. hydrogen fuel is often purified in a process that emits lots of greenhouse gases.