Because in reality there are frictional forces acting on the ball, against the direction of its motion. In fact, because of the friction between the ball and the surface, the ball loses little by little its energy, so its velocity decreases and eventually it stops.
In an ideal world with no friction, there would be no forces acting on the ball, so its energy must be conserved and this means that the ball would continue its motion forever.
Momentum is a product of mass and the velocity of a body. The initial momentum is always equal to the final momentum during collisions between two bodies.
Therefore; M1U1 +M2U2 = M1V1+ M2V2, where m1 is the mass of tracey and m2 is the mass of jonas, while u is the initial velocity and v is the final velocity.
(32 ×0)+ (45×0) = (32 × v1) + (45 × 0.50)
0 = 32V1 + 22.5
32 V1 = -22.5
V1 = - 0.703 ( negative indicates difference in direction)
There, Tracey's speed will be 0.703 m/s
We have the equation I = V/R ( according to ohm’s law
==> R = V / I
==> R = 120/0.75
==> R = 160 ohms
*I is current ( unit : ampere)
*V is voltage different and R is resistance
Answer:
The strength of gravity on the moon is .
Explanation:
We have,
Weight of the backpack, W = 9.2 N
Mass, m = 5 kg
It is required to find the strength of gravity on the moon. Weight of an object is given by :
W = mg
g is strength of gravity on the Moon
So, the strength of gravity on the moon is .
Answer:
A stretched rubber band has potential energy