1. A train moves on a straight line track , It covers first half of the distance at a speed speed 20Km/hr and the other half of the distance at a speed of 30km/hr the average speed of the train is:
2. A particle moves so that the displacement x at time t is given by x2 =1+t2.what is its acceleration.
3. A car, starting from rest, accelerates at the rate ‘ f ’ through a distance ‘s’, then continues at constant speed for time ‘t’ and then decelerates at the rate ‘f/2’ to come to rest. If the total distance traversed in 15s, then
4. A particle starts from rest and has an acceleration of 2m/s2 for 10 s. After that, it travels for 30 s with constant speed and then undergoes a retardation of 4 m/s2 and comes back to rest. The total distance covered by the particle is
5. An automobile travelling with a speed of 60 km/h, can brake to stop within a distance of 20 m. If car is going twice as fast i.e., 120 km/h , the stopping distance will be
6. A car travels a distance S on a straight road in two hours and then return to the starting point in the next three hours. Its average velocity is :
7. A train takes 1 hour to go from one station to another , it travels at a speed of 20 km/hr for half an hour and 30 km/hr for another half an hour. The average speed of the train is:
8. A car accelerates from rest at 5 ms-2 and then retards to rest at 3ms-2,the maximum velocity of the car is 30ms-1. What is the distance covered by the car ?
9. A car accelerates from rest for time t1 at constant rate a1 and then it retards at the constant rate a2 for time t2 and comes to rest. t1/t2 =
10. A car covers 1/3 part of total distance with a speed of 20 km/hr and second 1/3 part with a speed of 30 km/hr and rest of 1/3 part with a speed of 60 km/hr , The average speed of the car is: