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49 questions

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Question 21

jamb 1997

An object of mass 100g projected vertically upwards from the ground level has a velocity of 20ms\(^{-1}\) at a height of 10m. Calculate its initial kinetic energy at the ground level.[g = 10ms\(^{-2}\), neglect air resistance]

A10 J

B20 J

C30 J

D50 J

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Question 22

jamb 1997

A planet has mass m₁ and is at a distance r, from the sun. A second planet has mass m₂ = 10m₁ and at a distance of r₂ = 2r₁ from the sun. Determine the ratio of the gravitational force experienced by the planets.

A1 : 5

B2 : 5

C3 : 5

D4 : 5

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Question 23

jamb 1997

A body of mass 2kg moving vertically upwards has its velocity increased uniformly from 10ms^-1 to 40ms^-1 in 4s. Neglecting air resistance, calculate the upward vertical force acting on the body.[g = 10 ms^-1]

A15N

B20N

C35N

D45N

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Question 24

jamb 1997

Which of the following with respect to a body performing simple harmonic motion are in phase?

Adisplacement and velocity of the body

Bdisplacement and force on the body

Cvelocity and acceleration of the body

Dforce acting on the body and the acceleration

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Question 25

jamb 1997

Two bodies X and Y are projected on the same horizontal plane, with the same initial speed but at angles 30 and 60 respectively to the horizontal. Neglecting air resistance, the ratio of the range of X to that of Y is

A1:1

B1:2

C√3:1

D√3

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Question 26

jamb 1997

An arrow of mass 0.1kg moving with a horizontal velocity of 15ms^-1 is shot into a wooden block of mass 0.4kg lying at rest on a smooth horizontal surface. Their common velocity after impact is

A15.0 ms^-1

B7.5 ms^-1

C3.8 ms^-1

D3.0 ms^-1

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Question 27

jamb 1997

A 5kg block is released from rest on a smooth plane inclined at an angle of 30^o to the horizontal. What is the acceleration down the plane? [g = 10ms^-2]

A5.0 ms^-2

B5.8 ms^-2

C8.7 ms^-2

D25.0 ms^-2

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Question 28

jamb 1997

The distance x m travelled by a particle in time t seconds is described by the equation x = 10 + 12t\(^2\), Find the average speed of the particle between the time interval t = 2s and t = 5s

A60 ms^-1

B72 ms^-1

C84 ms^-1

D108 ms^-1

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Question 29

jamb 1997

At what respective values of X, Y and Z would the unit of force, the newton, be dimensionally equivalent to MxLyTz?

A-1, 1, 2

B1, 1, -2

C1, -1, 2

D-1, 1, -2

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