Q1
A car travels 100 m in 10 s. Its speed is:
📝 SolutionSpeed = distance/time = 100/10 = 10 m/s.
Q2
If a body starts from rest and accelerates at 2 m/s² for 5 s, its final velocity is:
📝 Solution$v = u + at = 0 + 2 \times 5 = 10$ m/s.
Q3
The first equation of motion is:
📝 SolutionThe first equation of motion relates final velocity to initial velocity, acceleration and time: $v = u + at$.
Q4
A body undergoing uniform circular motion has:
📝 SolutionIn uniform circular motion the speed stays constant, but the direction keeps changing, so velocity (and hence there is acceleration) changes continuously.
Q5
Using $s = ut + \frac{1}{2}at^2$, find distance covered by a body with $u=0$, $a=4\ m/s^2$, $t=3\ s$.
📝 Solution$s = 0 \times 3 + \frac{1}{2}(4)(3^2) = \frac{1}{2}(4)(9) = 18$ m.
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Class 9 · Science
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