Answer:
27.03 m/s.
Explanation:
vo = 0 m/s
vi = 115 km/h
Converting to m/s,
115 km/h * 1000 m/1 km * 1 h/3600 s
= 31.94 m/s.
Using equation of motion,
vi = vo + at
a = 31.94/13
= 2.46 m/s^2
After t = 11 s,
vi = 2.46 * 11
= 27.03 m/s.
It is possible for a wooden ruler to be worn out at the edge. If such a ruler is used for measurement, there will be error in the measurement due to the inaccuracy of the ruler. To avoid this, some rulers do not start with zero at the edge.
Conservation means to improve something to prevent loss or decay
That's why energy can't be created or destroyed
It is very interesting step about Relative velocity. Actually, when you'll see the speed of fly in relation to ground, then it's speed would be 65 mph as train is traveling by that speed but if a person in on Train, then fly is at rest for him
Hope this helps!
Answer:
The heavier one will have twice the kinetic energy of the lighter one.
Explanation:
For the objects of mass m and 2 m , kinetic energy is
0.5 m v² and 0.5 (2 m) v² respectively. So kinetic energy of the mass 2 m is Twice that of the object of mass m, since their final velocities are equal.
When an object is dropped from the top of a building ( or from some height), its acceleration is equal to the acceleration due to gravity and has a zero initial velocity. On reaching the ground, the final velocity attained by the object depends only on the gravity and the height of fall, as given by the equation v = √2 g h.
So final velocity is independent of the mass of the object. But kinetic energy is 0.5 m v² , which shows that it depends on the mass of the object and square of the velocity.