A car traveling with an initial speed of 20 m/s slows down at a constant rate -2.5 m/s for a time of 4 seconds. What is the velocity at the end of this time?

If the textbook weighs 19.6 newtons on venus, what is the strength of gravity on venus?

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.