The boy starts from rest and reaches 40 m/s in l0 sec what is its acceleration.
6 m/s2
4 m/s2
8 m/s2
2 m/s2
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 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
What is the SI unit of acceleration ?
km/h2
m/s2
m/h2
km/s2
A car starting from rest acquires a speed 25 m/s in 10 sec after which it maintains this speed for 10 s .Find acceleration .
2.5 m/s2
1 m/s2
1.5 m/s 2
Rate of change of velocity is _________ .
Velocity
Acceleration
Speed
Displacement
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 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
Acceleration of an object is equal to
speed / time
velocity / time
change in velocity / time
change in speed/ time
A bus decreases its speed from 80 km/h to 60 km/h in 5 seconds.Find the acceleration of the bus.
1.11 m/s2
-1.11 m/s2
2.11 m/s2
-2.11 m/s2
