Question

Hello...
please someone help me with the following questions..

2. A bus starting from rest attains a velocity of 72 km/hr in 5 minutes. Assuming that the
acceleration is uniform, find
(i) the acceleration
(ii) the distance travelled by the train for attaining this velocity.
3. Which is greater, 60km/hr or 15m/s? Compare and conclude your answer.
4. A train is moving at a speed of 90km/h. On applying brakes, a retardation of 2.5m/s2 is
created. At what distance before, should the driver apply the brakes to stop the train at the
station?
​

Answer 1

Answer:

For acceleration ..

U=0 because initially object is in rest

V is given 72km/h .

And time is 4 min

You should change velocity in m/s by multiplying by 5/18 and time by multiplying 60

The you u need the formula for ace..

V=u+at

2) use formula s=ut+1/2 at×t

3) 60km/h is grater

4) first of all u need to find the time when we is 0 use formula v=u+at

V=0

U=72×(5/18)

A= -2

When u calculate the time the use formula s=ut+1/2at×t

Explanation:

Answer 2

Answer:

plz yar .........

last bar plz...............

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