What is the kinetic energy of the cart if it is moving at a speed of 3 m/s at the bottom of the ramp? A. 45 J
B. 22.5 J
C. 7.5J
D. 0 J ​

Explain why electric current cannot exist if a current doesn't have a voltage source.

Acar travels 40m in 8 seconds find the car speed

Afaulty model rocket moves in the xy-plane (the positive y direction is vertically upward). the rocket's acceleration has components ax(t) = ? t2 and ay(t) = ? ? ? t, where ? = 2.50 m/s4 , ? = 9.00 m/s2 , and ? = 1.40 m/s3 . at t = 0 the rocket is at the origin and has velocity ~v0 = v0x ? i + v0y ? j with v0x = 1.00 m/s and v0y = 7.00 m/s. (a) calculate the velocity and position vectors as functions of time. (b) what is the maximum height reached by the rocket? (c) sketch the path of the rocket. (d) what is the horizontal displacement of the rocket when it returns to y = 0?