Download App

Motion — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceMotion2 Marks
Question
An object is moving along a straight line with uniform acceleration. The following table gives the velocity of the object at various instants of time:
Time (in sec.):
0
1
2
3
4
5
6
Velocity (in m/s):
2
4
6
8
10
12
14
Plot the graph.
From the graph,
  1. Find the velocity of the object at the end of 2.5 seconds.
  2. Calculate the acceleration.
  3. Calculate the distance covered in the last 4 seconds.
✓

Answer

$\text{a}=\frac{\text{v}-\text{u}}{\text{t}}$

$\text{a}=\frac{4-2}{1}=2\text{m/s}^2$

Now for,

$\text{t}=2.5$

$\text{a}=\frac{\text{v}-\text{u}}{\text{t}}$

$2=\frac{\text{v}-2}{2.5}$

$5=\text{v}-2$

$\text{v}=7$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Que-Ans (Each of 2 Mark )" from Motion→Motion — all question types→Science STD 9 question papers→Gujarat Board STD 9 question papers→Gujarat Board question paper generator→

Similar questions

If one mole of nitrogen molecules weights 28g, calculate the mass of one molecule of nitrogen in grams.
→
Akhtar, Kiran and Rahul were riding in a motorcar that was moving with a high velocity on an expressway when an insect hit the windshield and got stuck on the windscreen. Akhtar and Kiran started pondering over the situation. Kiran suggested that the insect suffered a greater change in momentum as compared to the change in momentum of the motorcar (because the change in the velocity of the insect was much more than that of the motorcar). Akhtar said that since the motorcar was moving with a larger velocity, it exerted a larger force on the insect. And as a result the insect died. Rahul while putting an entirely new explanation said that both the motorcar and the insect experienced the same force and a change in their momentum. Comment on these suggestions.
→
What information do you get from the Fig. about the atomic number, mass number and valency of atoms X, Y and Z? Give your answer in a tabular form.

→
A man is instructed to carry a package from the base camp at B to submit A of a hill at a height of 1200 metres. The man weighs 800N and the package weighs 200N. If g = 10m/s2,
  1. How much work does man do against gravity?
  2. What is the potential energy of the package at A if it is assumed to be 
→
Differentiate the following activities on the basis of voluntary (V) or involuntary (IV) muscles.
Movement of chocolate in your intestine.
→
The cells of stratified squamous epithelium are arranged in many layers. Why?
→

Name two factors on which shape of the cell depends.

→

A force of 50N acts on a body and moves it a distance of 4m on a horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.

→
Two persons manage to push a motorcar of mass 1200kg at a uniform velocity along a level road. The same motorcar can be pushed by three persons to produce an acceleration of 0.2m s-2. With what force does each person push the motorcar? (Assume that all persons push the motorcar with the same muscular effort.)
→
What is a chemical change?
Give two examples of chemical changes.
→