Need help!! ASAP 45 PTS A car is coasting backwards down a hill at -3.0 m/s when the driver gets the engine started. After 2.5 seconds, the car is moving uphill at a velocity of +4.5 m/s. What is the car’s average acceleration?

PLEASE EXPLAIN IF YOU CAN TOO. It’s for a friend I haven’t taken physics yet

Awoman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. the book has a mass of m = 1.8 kg and the coefficient of static friction between her hand and the book is μs = 0.67. no attempt 50% part (a) what is the weight of the book, fgb in newtons?

More solar radiation is absorbed by earth’s surface than by

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?