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
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
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
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
What is the SI unit of acceleration ?
km/h2
m/s2
m/h2
km/s2
A car starts at a speed of 5 m/s and accelerates at 2.5 m/s2 .What distance must the car should travel to reach a speed of 10m/s ?
20 m
15 m
17 m
12 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
Rate of change of velocity is _________ .
Velocity
Acceleration
Speed
Displacement
In the equation s = ut + 1/2 at2 what does s represent .
distance
speed
velocity
Acceleration.
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
