Define weight A car falls off a ledge and drops to the ground in 0.5 seconds. let g= 10m/s square , then
Answers
Answer:
A car falls off a ledge and drops to the ground in 0.5 seconds.
Let g=10ms
−2
, then
(a) What is its speed on striking the ground?
(b) What is its average speed during 0.5 second?
(c) How high is the ledge from the ground?
ANSWER
Given,
time taken=0.5s
g=10ms
−2
As the car is under free fall, the initial speed is zero.
(a) Under free fall,
u=0
a=g
v=u+at
v=0+10×0.5
v=5ms
−1
(b) Average speed =
2
u+v
=
2
0+5
=2.5ms
−1
(c) From newton's equation of motion, As u=0,
h=ut+
2
1
gt
2
When h is the height, t is the time of free fall, g is the acceleration due to gravity. Putting the values in the above equation, we get
h=
2
1
×10×(0.5)
2
=5×0.25=1.25m
Explanation:
The force with which an object near the Earth or another celestial body is attracted toward the center of the body by gravity. An object's weight depends on its mass and the strength of the gravitational pull.