If a body is moving with a uniform retardation, then its acceleration will be:

1. Positive
2. Negative
3. Zero
4. Cannot say

A car acquires a velocity of 54 ms^-1 in 20 s starting from rest, then its acceleration is:

1. 5.4 ms^-2
2. 2.7 ms^-2
3. 7.2 ms^-2
4. 2.0 ms^-2

A body initially at rest, starts moving with a constant acceleration of 0.5 ms^-2 and travels a distance 25 m, then its final velocity is:

1. 5 ms^-1
2. 20 ms^-1
3. 15 ms^-1
4. -15 ms^-1

A car starting from rest accelerates uniformly to acquire a speed 20 km h^-1 in 30 min. The distance travelled by car in this time interval will be —

1. 600 km
2. 5 km
3. 6 km
4. 10 km