A car traveling 35 km/hr accelerates to a speed of 45 km/hr in 0.25 hr . What is its acceleration

Is the number of complete movements of a wave per second.

Abody covers a semicircle of radius 7cm in 5s .find its linear speed

Which of the following describe possible scenarios? a) an object has zero instantaneous velocity and non-zero acceleration. b) an object has negative acceleration and is speeding up. c) an object has positive acceleration and constant velocity. d) an object has positive velocity and zero acceleration. e) an object has increasing positive position and negative velocity. f) an object has decreasing positive position and negative acceleration.