Answer:
I think (d) is right answer
Answer:
Explanation:
Let assume that ball strikes a vertical wall in horizontal direction. The situation can be modelled by the appropriate use of the definition of Moment and Impulse Theorem, that is:
The average force acting on the ball during the collision is:
Oil is less dense than water or most liquids found in Saldana dressing, so the denser liquid sinks to the bottom, leaving the oil on top. It's same principle on how a helium balloon floats in air, the helium is less density than the air around it.
Answer:
(a) 23 m/s, -4 m/s²
(b) Speed is decreasing.
Explanation:
The velocity of the object is given as:
v(t) = 27 - t²
When t = 2 secs, velocity, v(2) becomes:
v(2) = 27 - (2)²
v(2) = 27 - 4
v(2) = 23 m/s
The acceleration is the first derivative of the velocity, dv/dt:
a(t) = dv(t)/dt = -2t
Acceleration after 2 secs, a(2) is:
a(2) = -2*2
a(2) = -4 m/s²
(b) When velocity and acceleration have opposite signs, it means that the velocity and acceleration are in opposite directions, hence, the object is slowing down.
In other words, the speed is decreasing.
