Question

Solve the following Numericals.
a) A train accelerates from 36 km/h to 54 km/h in 10 sec.
(i) Acceleration
(ii) The distance travelled by car.
b) A train starts from rest and accelerate uniformly at the rate of 5 m/s2 for 5 sec. Calculate the velocity of train in 5 sec.
c) The maximum speed of a train is 90 km/h. It takes 10 hours to cover a distance of 500 km. Find the ratio of its average speed to maximum speed?
d) A ball is thrown upwards and it goes to the height 100 m and comes down
1) What is the net displacement?
2) What is the net distance?
e) Two cars A and B race each other. The Car A ran for 2 minute at a speed of 7.5 km/h, slept for 56 minute and again ran for 2 minute at a speed of 7.5 km/h. find the average speed of the car A in the race.​

Answer 1

Answer:

v-u/t=v=15m/s

u=10m/s

t=20s

now,

15-10/20=1/4=0.25m/s²

Explanation:

v²-u²=2as

15²-10²=2×10×s

225-100=20s

125/20=6.25 m