Question

3. A body dropped from the top of a tower reaches the ground in 4 s. Height of the tower is
(a) 39.2 m
(b) 44.1 m
(c) 58.8 m
4. The speed of a car reduces from 15 m's to 5 m/s over a displacement of 10 m.
The uniform acceleration of the car is :
(a) -10 m/s
(b) + 10 m/s
(c) 2 m/s
(d) 0.5 m
5. A body projected vertically up with a velocity 10 m's reaches a height of 20 m. If it is projected with
velocity of 20 m/s, then the maximum height reached by the body is :
(a) 20 m
(b) 10 m
(c) 80 m
(d) 40 m
6. What does the area of an acceleration-time graph represent?
(a) Uniform velocity (b) Displacement (c) Distance
(d) Variable velocity
7. A driver applies brakes when he sees a child on the railway track, the speed of the train reduces from
54 km/h to 18 km h in 5 s. What is the distance travelled by the train during this interval of time
(a) 52 m
(b) 50 m
(c) 25 m
(d) 80 m​

Answer 1

Answer:

Explanation:

Check the link for question no. 5

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.quora.com/A-body-projected-vertically-up-with-a-velocity-of-10ms-1-reaches-a-height-of-20m-If-it-is-projected-with-the-velocity-of-20ms-1-then-what-is-the-maximum-height-reached-by-the-body&ved=2ahUKEwiL7uPi__XjAhWFN48KHXPvA6gQFjAAegQIARAB&usg=AOvVaw1LgXckaX6df7N4YsmsY0c4

6 variable velocity