Advertisements
Advertisements
Question
An object moves 18 m in the first 3 s, 22 m in the next 3 s and 14 m in the last 3 s. What is its average speed?
Solution
Given, s1 = 18 m, t1 = 3 s, s2 = 22 m, t2 = 3 s, s3 = 14 m, t3 = 3 s
Average speed = ?
Average speed = `"Total distance"/"Total Time"`
Average speed = `(s_1 + s_2 + s_3)/(t_1 + t_2 + t_3)`
= `(18 + 22 + 14)/(3 + 3 + 3)`
= `54/9`
= 6 m/s.
APPEARS IN
RELATED QUESTIONS
A bullet having a mass of 10 g and moving with a speed of 1.5 m/s, penetrates a thick wooden plank of mass 900 g. The plank was initially at rest. The bullet gets embedded in the plank and both move together. Determine their velocity.
A person swims 100 m in the first 40 s, 80 m in the next 40 s and 45 m in the last 20 s. What is the average speed?
Train A and train B are running on ·parallel tracks in opposite directions with speeds 36 km/hour and 72 km/hour, respectively A person is walking in train A in the direction opposite to its motion with a speed of 1.8 km/hour. Speed (in ms-1) of this person as observed from train B will be close to: (take the distance between the tracks as negligible)
The velocity at which the mass of a particle becomes twice its rest mass will be ______.
Give scientific reasons.
The velocity of an object at rest is considered to be uniform.
Give scientific reason.
The velocity of an object at rest is considered to be uniform.
Give scientific reasons.
The velocity of an object at rest is considered to be uniform.
Give scientific reason.
The velocity of an object at rest is considered to be uniform.
Give scientific reason.
The velocity of an object at rest is considered to be uniform.
Give scientific reason.
The velocity of an object at rest is considered to be uniform.
