# Month: May 2015

• ## A body moving with constant acceleration | travels the distance 3 metre and 8 metre respectively in 1 second and 2 second | calculate the initial velocity and the acceleration of body | Sum Motion in one Dimension – Physics class 9

Problem :     A body moving with constant acceleration travels the distance 3 metre and 8 metre respectively in one second 2 second. Calculate the 1) initial velocity and 2) the acceleration of body. Data given: Distance(s1) = 3m Time taken (t1) to travel 3 m =1 secondDistance(s2) = 8m Time taken (t2) to…

• ## Summary of Journey by Night | For Classv9

Sher Singh was a 12 year old brave boy; who lived in Laldwani village. He lived with his younger brother, mother and father. Sher Singh Bahadur was father of Sher Singh. Sher Sing’s younger brother’s name was Kunwar. He was a farmer by occupation but he was a famous hunter too. Whenever there was an…

• ## Walking at 3/5 of his usual speed, a man is 4 hours too Late | Find his usual time | Speed Distance and Time

Walking at 3/5 of his usual speed,  a man is 4 hours too late.  Find his usual time. Suppose the usual speed of the man be x km/hr .Let distance travelled be D km Therefore usual Time taken = D / x.’. walking speed = 3/5. x Let distance travelled be D km we can…

• ## A body moves from rest with uniform acceleration and travels 270 metre in 3 seconds | Find the velocity of the body at 10 seconds after the start | Sum Motion in one Dimension – Physics class 9

Problem : A body moves from rest with uniform acceleration and travels 270 metre in 3 seconds. Find the velocity of the body at 10 seconds after the start. Initial velocity (u)= 0Distance(s) = 270m Time taken (t)=3s final velocity after 10 s (v10)= ? First we will calculate acceleration.We know s = ut +…

• ## When brakes are applied to a bus the retardation produced is 25 cm/s2 and the bus takes 20 s to stop | calculate the initial velocity of bus the distance traveled by bus during this time |

Problem : When brakes are applied to a bus the retardation produced is 25 centimetre per second square (cm/s2 )and the bus takes 20 seconds to stop. Calculate a)the initial velocity of bus b) the distance traveled by bus during this time Data given:Retardation (-a) = – 25 cm/s2 Time taken to get stopped (tav)=20…

• ## A car travels a distance 100 metre with a constant acceleration and average velocity of 20 metre per second | The final velocity required by the car is 25 metre per second | Find the initial velocity and acceleration of car | Sum Motion in one Dimension – Physics class 9

Problem: A car travels a distance 100 metre with a constant acceleration and average velocity of 20 metre per second. The final velocity required by the car is 25 metre per second. Find 1) the initial velocity and 2) acceleration of car Data given:Distance(s) = 100 metreAcceleration(a) = ? ( to calculate)Average velocity(vav)=20 metre…