Question

give me some toughest sums for motion for class 9

Answer 1

hiii,

Question 1
●Two cars A and B race each other. The Car A ran for 2 min at a speed of 7.5 km/h, slept for 56 min and again ran for 2 min at a speed of 7.5 km/h. find the average speed of the car A in the race.

Question 2
●Anand leaves his house at 8.30 a.m. for his school. The school is 2 km away and classes start at 9.00 a.m. If he walks at a speed of 3 km/h for the first kilometer, at what speed should he walk the second kilometer to reach just in time?

Question 3
●An object moves along a straight line with an acceleration of 2 m/s2. If its initial speed is 10 m/s, what will be its speed 2 s later?

Question 4
●A bullet hits a Sand box with a velocity of 20 m/s and penetrates it up to a distance of 6 cm. Find the deceleration of the bullet in the sand box.

Question 5
●A particle experiences constant acceleration for 20 seconds after starting from rest. If it travels a distance D1 in the first 10 seconds and distance D2 in the next 10 seconds then, 
(a) D2 = D1
(b) D2 = 2D1
(c) D2 = 3D1
(d)  D2 = 4D1

hope helps
 

Answer 2

Answer:

Explanation:

3 v= u+at

V= 10 + 2×2

V = 10+ 4

V =14m/s