Question

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Answer 1

Explanation:

a) a=v-u/t

v=20m/s

u=0

t=40s

.:a=20-0/40

a=0.5m/s^2

b)Because the car moves with equal velocity in equal time interval

c)zero

d)acceleration is constant

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Answer 2

Answer:

Here is your answer

Explanation:

First you have to remember some the formulations including:-

1) acceleration=velocity/time

2) velocity=displacement/time.

Now according to question. Now put the values according to formula

At time=0 and velocity=0 then acceleration will be also 0.

$a = \frac{v}{t} = \frac{0}{0} = 0$

Now at time=10s and velocity at v=5m/s then acceleration will be 0.5m/s^2

$a = \frac{5}{10 } = 0.5$

Now it can be concluded that in each and every case acceleration will be 0.5 or 1/2m/s^2

ii) when an object said to be in uniform motion? when it travels equal distance in equal interval of time. Here velocity is equal with equal interval of time. Suppose an body no- 1 is moving with speed of 10m/s and time take for it is 5s then and speed of another body is 20m/s is and time taken is 10s then it is said to be in uniform motion. it is increasing with fixed amount (value). Hence it can concluded that acceleration is uniform.

iii) If initial velocity is equal to final velocity then acceleration will be zero because there is no overall moment . For example if you backed your car out of the driveway and drove around for a few hours at various speeds then parked the car back in the driveway at exactly the same spot the final velocity would be zero, exactly the same as the initial velocity before you started the car and backed out. Similarly, every time you stopped the car you would have zero velocity no matter where your were. Or if you never moved the car in the first place .

iv) When v-t graph shows velocity as line it means velocity is constant