Motion and Time

case i , speed = 40 km/h ,time = 15 min= 0.25 hour , distance = speed x time = 40 x 0.25 = 10 km case ii , , speed = 60 km/h ,time = 15 min= 0.25 hour , distance = speed x time = 60 x 0.25 = 15 km total distance …

A car moves with a speed of 40 km/h for 15 minutes and then with a
speed of 60 km/h for the next 15 minutes. The total distance covered by
the car is:
(i) 100 km (ii) 25 km
(iii) 15 km (iv) 10 km Read More »

iv ) m/s

ii ) SPEED = DISTANCE/TIME

Time = 15 min = 15*60 sec = 900 sec Seped = 2 m/s Distance = speed * time = 2 m/s * 900 sec = 1800 m

Distance (d) = 240 km = 240 * 1000 = 240000 m Time = 4 hours = 4* 3600 SEC = 14400 SEC SPEED = DISTANCE/ TIME = 240 KM/ 4 HOURS = 60 KM/HR OR , SPEED= D/T = 240000 m / 14400 s = 16.67 m/s

Time= 32 sec , No of Oscillation = 20 oscillation Time period = ? Time period = No of oscillation /time = 20/32 = 0.625 sec

The speed of an object is the distance travelled divided by the time taken to cover that distance Its basic or, S.I unit is metre per second (m/s).

The distance moved by an object in a unit time is called its speed.

There is an interesting story about the discovery that the time period of a given pendulum is constant. You might have heard the name of famous scientist Galileo Galilie (A.D. 1564 –1642). It is said that once Galileo was sitting in achurch. He noticed that a lamp suspended from the ceiling with a chain was …

What is the discovery that the time period of a given pendulum? Read More »

The basic or S.I. unit of time is a second. Its symbol is s. Larger units of time are minutes (min) and hours (h).