SATHEE: Chapter 07 Motion Questions-03

Chapter 07 Motion Questions-03

Questions

1. When will you say a body is in (i) uniform acceleration? (ii) nonuniform acceleration?

Show Answer

Answer

(i) A body is said to be in uniform acceleration if it travels in a straight line and its velocity increases or decreases by equal amounts in equal intervals of time.

(ii) A body is said to be in nonuniform acceleration if the rate of change of its velocity is not constant.

2. A bus decreases its speed from $80km h^{- 1}$ to $60km h^{- 1}$ in 5 s. Find the acceleration of the bus.

Show Answer

Answer

Initial speed of the bus, $u = 80 k m / h = 80 \times \frac{5}{18} = 22.22 m / s$

Final speed of the bus, $v = 60 k m / h = 60 \times \frac{5}{18} = 16.66 m / s$

Time take to decrease the speed, $t = 5 s$

Acceleration, $a = \frac{v - u}{t} = \frac{16.66 - 22.22}{5} = - 1.112 m / s^{2}$

3. A train starting from a railway station and moving with uniform acceleration attains a speed 40 km h–1 in 10 minutes. Find its acceleration.

Show Answer

Answer

Initial velocity of the train, $u = 0$

Final velocity of the train, $v = 40 k m / h = 40 \times \frac{5}{18} = 11.11 m / s$

Time taken, $t = 10 m i n = 10 \times 60 = 600 s$

Acceleration, $a = \frac{v - u}{t} = \frac{11.11 - 0}{600} = 0.0185 m / s^{2}$

Hence, the acceleration of the train is $0.0185 m / s^{2}$ .

Chapter 07 Motion Questions-03

Questions

Table of Contents

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Mentorship

NCERT Exercise Video Solution

Chapter 07 Motion Questions-03

Questions

Table of Contents

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Mentorship

NCERT Exercise Video Solution

Menu