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Question 20: An object starting from rest travels 20 m in firs

Science Exemplar

Class 9

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Question 19: An object is dropped from rest at a height of 150 m and simultaneously another object is dropped from rest at a height 100 m. What is the difference in their heights after 2 s if both the objects drop with same accelerations? How does the difference in heights vary with time?

Question 20: An object starting from rest travels 20 m in first 2 s and 160 m in next 4 s. What will be the velocity after 7 s from the start.

Question 22: An electron moving with a velocity of 5 × 10^{4 m s^{–1 enters into a uniform electric field and acquires a uniform acceleration of 10^{4 m s^{–2 in the direction of its initial motion.

(i) Calculate the time in which the electron would acquire a velocity double of its initial velocity.

(ii) How much distance the electron would cover in this time?}}}}

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Question

Question 20: An object starting from rest travels 20 m in first 2 s and 160 m in next 4 s. What will be the velocity after 7 s from the start.

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Updated on: Aug 10, 2023

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Question 20: An object starting from rest travels 20 m in first 2 s and 160 m in next 4 s. What will be the velocity after 7 s from the start.

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Text solutionVerified

Answer: Time (

t

) = 2 s
distance (

s

) = 20 m
Initial velocity (

u

) = 0 m/s
Applying second equation of motion:

s = u t + \frac{1}{2} a t^{2}

s = (0 \times 2) + (\frac{1}{2} \times a \times 2^{2}) 20 = 2 a a = 10 m / s^{2}

Velocity of the body after 7 s from the start

v = u + a t v = 0 + (10 \times 7) v = 70 m / s

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Question Text	Question 20: An object starting from rest travels 20 m in first 2 s and 160 m in next 4 s. What will be the velocity after 7 s from the start.
Updated On	Aug 10, 2023
Topic	Motion
Subject	Science
Class	Class 9
Answer Type	Text solution:1 Video solution: 8
Upvotes	800
Avg. Video Duration	7 min

Question 20: An object starting from rest travels 20 m in first 2 s and 160 m in next 4 s. What will be the velocity after 7 s from the start.

Text solutionVerified

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