Answer:
Acceleration of the train is -3 m/s²
Explanation:
Since it stops,
final velocity (v) = 0 m/s
time (t) = 25 seconds
initial velocity(u) = 75 m/s
Now,
accelereation = (v-u)/t
or, a = (0-75)/25
or, a = -75/25
so, a = -3 m/s²
Answer:
Explanation:
F = ma and
We have F, we have m, but in order to solve for v, we need a.
30.0 = 3.00a so
a = 10.0 m/s/s. Plug that in for a in the second equation and solve for v:
so
v = 10.0(3.00) so
v = 30.0 m/s
<u>Complete Question:</u>
A hockey player swings her hockey stick and strikes a puck. According to Newton’s third law of motion, which of the following is a reaction to the stick pushing on the puck?
A. the puck pushing on the stick
.
B. the stick pushing on the player
.
C. the player pushing on the stick
.
D. the puck pushing on the player.
<u>Correct Option:</u>
According to Newton’s third law of motion the puck pushing on the stick is a reaction to the stick pushing on the puck.
<u>Option: A</u>
<u>Explanation:</u>
As when the hockey exert force on the puck (which is a flat ball basically used in ice hockey) then this action by hockey will receive equal and opposite reaction by puck. Thus when the stick is pushing on the this flat ball, then puck also push the stick. This is understood by newton's third law pf motion, where action and reaction forces are subject of discussion, displaying their is pair of forces applied among the interacting objects. This form is observed more practically in life and very frequent.
<span>When sound waves travel from air into water, they'll immediately
start moving faster. (Their speed will increase.)
Of course, this means that although their frequency won't change,
their wavelength will increase.</span>
<u>Answer:</u>
If a car weighs 6310 N on earth, its mass = 643.22 kg.
<u>Explanation:</u>
Weight of a body is given by the product of it's mass and acceleration due to gravity on that planet.
So weight of body in earth = mass of body* acceleration due to gravity on earth.
Acceleration due to gravity in earth =
Here it is given weight of car = 6310 N
So we have, 6310 = mass of car* 9.81
Mass of car = 6310/9.81 = 643.22 kg.
So If a car weighs 6310 N on earth, its mass = 643.22 kg.