A car reduced its speed from 90 km/h to 40 km / h in 10 sec What is the acceleration of the body .
-5 m/s2
5 m/s2
1.389 m/s2
-1.389 m/s2
In the equation s = ut + 1/2 at2 what does s represent .
distance
speed
velocity
Acceleration.
Acceleration of an object is equal to
speed / time
velocity / time
change in velocity / time
change in speed/ time
A particle is pushed always a horizontal surface in such a way that it start with a velcoity of 12 m/s and decreases at the rate of 0.5 m/s2. The time it wil take to come to rest is
42 s
48 s
24 s
84 s
An electron moving with a velocity of 5 x 104 ms-1 enters into a uniform electric field and acquires a uniform acceleration of 104 m/s2 in the direction of its initial motion.Calculate the time in which the electron would acquire a velocity double of its initial velocity.
10 s
5 s
7 s
15 s
A bus starting from rest moves with a uniform acceleration of 0.1 m/s2 for 2 minutes.Find the speed acquired and the distance travelled.
12 m/s, 720 m
14 m/s,620 m
12 m/s,700 m
10 m/s,720 m
What is the SI unit of acceleration ?
km/h2
m/s2
m/h2
km/s2
A racing car has a uniform acceleration of 4 m s-2. What distance will it cover in 10 s after start?
250 m
140 m
150 m
200 m
A car travelling at a speed 54 km/hr is brought to rest in 90 s .Find the retardation and distance travelled by the car before coming to rest .
0.16 m/s2 , 675 m
0.4 m/s2 , 600 m
2 m/s2 , 500 m
None of these
A train is travelling at a speed of 90 km/h.Brakes are applied so as to produce a uniform acceleration of -0.5 m/s2 .Find how far the train will go,before it is brought to rest.
725 m
564 m
625 m
600 m
