Projectiles - Jamb Physics Past Questions and Answers

Question 6:

• JAMB 1987

A jet engine develops a thrust of 270Ns when the velocity of the exhaust gases relative to the engine is 300ms^-1. What is the mass of the material ejected per second?

A. 81.00kg
B. 9.00kg
C. 0.90kg
D. 0.09kg

Question 7:

• JAMB 1992

A stone, Q is thrown with velocity U at an angle of 75^o to the horizontal. Another stone R is thrown with the same velocity U but with an angle of 15^o to the horizontal. The ranges covered by the stones will be

A. Greater for Q
B. Greater for R
C. The same for Q and R
D. Greater for the heavier of the two stones

Question 8:

• JAMB 1993

A rocket burns fuel at the rate of 10kgs^-1 and ejects it with velocity of 5 x 10³ms^-1. The thrust exerted by the gas on the rock is

A. 2.5 x 10⁷N
B. 5.0 x 10⁴N
C. 5.0 x 10²N
D. 2.0 x 10^-3N

Question 9:

• JAMB 1994

An object is projected with a velocity of 80ms^-1 at an angle of 30^o to the horizontal.The maximum height reached is

A. 20m
B. 80m
C. 160m
D. 320m

Question 10:

• 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

A. 1:1
B. 1:2
C. √3:1
D. √3