Ignoring air resistance:
acceleration due to gravity is approx 9.81 m/s²
Using Newton's equation of motion:
v = u + at
where:
Taking g as 9.81 m/s² this makes the final velocity v ≈ 8 s × 9.81 m/s² = 78.48 m/s ≈ 78.5 m/s
The final velocity will be -78.4 m/s. The negative sign means the motion is downward.
Use equation: vf = vi + g x t, where vf is final velocity, vi is initial velocity, g is acceleration due to gravity, and t is time interval.
Known
vi = 0 m/s
g = -9.8 m/s/s = -9.8 m/s2
t = 8 s
Unknown
vf
Solution
Plug in the known values and solve.
vf = 0 + (-9.8 m/s/s) x 8 s
vf = -78.4 m/s
Approx 78 metres per second.
The answer will depend on its acceleration.
The velocity is gravity acceleration x time or (9.8)(1.5) = 14.7 m/s. The velocity is not dependent on the mass.
Velocity at time 0 sec = 0m per sec Velocity at time 3 sec = 45m per sec Acceleration is 45/3 = 15m per sec if the acceleration is uniform
An object travelling at a velocity close to the speed of light had a higher mass than when at rest.
It means there is no velocity - it is at rest and nothing is moving. The slope of the line is velocity - a horizontal line is zero slope = zero velocity
78.4 m/s
490 meters
A stone falls freely from rest The total distance covered by it in the last second of its motion equals the distance covered by it in the first three seconds How long does the stone remain in air?
The acceleration of gravity is 9.8 meters (32.2 ft) per second2.Neglecting air resistance . . .After 8 seconds, the speed is (9.8 x 8) = 78.4 meters per second. (rounded)After 8 seconds, the speed is (32.2 x 8) = 257.6 feet per second. (rounded)
The answer will depend on its acceleration.
0.7848 meter
78.46 meters (257.4 feet)
It stops accelerating, and falls the rest of the way at constant speed.
Assuming the object free-falls, we may use:x = x0 + v0t + at2/2x0 = 0 (we determine it)v0t = 0 (dropped from rest).a = g = 10 m/st2 = 16s2.x = 10*16 / 2 = 80m.
98 meters (322 feet) per second.
Velocity* v = u + at * v = 0 + 9.8 x 8 * v = 78.4 m/sDisplacement* s = ut + ½at2 * s = 0 + ½ x 9.8 x 82 * s = 4.9 x 64 * s = 313.6 m
The equation for speed or fast is v=at and the distance is d=1/2 at2 the acceleration is 'a'.