\(m/s^{ -2 }\) is the SI unit of 

In the equation: ​\(s=u+\frac { 1 }{ 2 } at^{ 2 }\quad \)s stands for distance covered in

A ball is thrown vertically upwards It rises to a height of 50 m and comes back to the thrower

The initial velocity of a train which is stopped in 20 s by applying brakes retardation due to brakes being 1.5 \(ms^{ -2 }\) is

When a graph of one quantity versus another results in a straight line, the quantity are

(a) An object travels 30 m in 4 s and then another 30 m is 2 s What is the average speed of the object?
(b) Is the data given above sufficient to find average velocity of the object?
(c) Under what conditions is the magnitude of average velocity of an object equal to its average speed?

A cheetah is the fastest land animal and can achieve a peak velocity of 100 km/h upto distance less than 500m.If a cheetah spots his prey at a distance of 100 m, what is the minimum time it will take to get its prey,if the average velocity attained by it is 90 km/h.

A body starts initially with a velocity 'u' and is accelerated at constant rate 'a' Find an expression for final velocity after time 't'.

Mention the uses of a velocity-time graph.

State the S.I unit of speed A girl moves with the speed of 6 km/h for 2 h and with the speed of 4 km/h for the next 3 h find the average speed of the girl and the total distance moved.

Define acceleration .Is it a scalar or a vector quantity?

Deduce the expression for the distance travelled by a body moving with uniform acceleration in a given time.

An athlete completes one round of a circular track of diameter 200 m in 40 s. What will be the distance covered and the displacement at the end of 2 minutes 20 s?

Abdul, while driving to school, computes the average speed for his trip to be 20 km h^–1. On his return trip along the same route, there is less traffic and the average speed is 30 km h^–1. What is the average speed for Abdul’s trip?

You must have the story of the hare and tortoise. The two started simultaneously from the same point for a common destination. The hare slept for sometime along the way, and the tortoise reached the destination first. Since in this journey the tortoise took less time than the hare, the average speed of the tortoise was greater than that of the hare. But everyone knows that when the hare was actually running, it was much faster than the tortoise.
(a) Define the term speed.
(b) What is the S.I. unit of speed?
(c) Define average speed.
(d) Can the average speed of an object be negative?

What are the uses of graphical study of motion?

On a 100 km track , a train travels the first 30 km at a uniform speed of 30 km \(h^{ -1 }\)How fast must the train travel the next 70 km so as to average 40 km \(h^{ -1 }\) for the entire trip?

A scotter starts from rest moves in a straight line with a constant acceleration and covers a distance of 64 m in 4s.
(i) Calculate its acceleration and its final velocity.
(ii) At what time the scooter had covered half the total distance?