at which point should a researcher inform the respondents about the use of deception in a psychological study ? ?

a.
at the start of the study
b. at the end of the study
c. after publishing the study
d. during the course of the study

A10.0 kg cart and a 15kg cart are locked together with a compressed spring between them. they are then released so that the spring pushes the two carts apart. the 10.0 kg cart is moving at 4.5 m/s afterward. how fast is the 15kg cart moving? 3.0 m/s 2.0 m/s 4.5 m/s 5.0 m/s

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

How is zig zagging a form of acceleration?